ager@google.com
37499dce81
- Use only one thread to wait for multiple process objects. - Fix issue where reading from a closed pipe would print an error message on stderr. - Remove the need to go to dart before removing a processinfo object from the list. Sometimes you never get there so we have to remove the process info object always. BUG= TEST= Review URL: https://chromiumcodereview.appspot.com//9310053 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@3844 260f80e4-7a28-3924-810f-c04153c831b5
653 lines
22 KiB
C++
653 lines
22 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include <process.h>
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#include "bin/builtin.h"
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#include "bin/process.h"
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#include "bin/eventhandler.h"
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#include "bin/thread.h"
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#include "platform/globals.h"
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static const int kReadHandle = 0;
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static const int kWriteHandle = 1;
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// ProcessInfo is used to map a process id to the process handle and
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// the pipe used to communicate the exit code of the process to Dart.
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// ProcessInfo objects are kept in the static singly-linked
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// ProcessInfoList.
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class ProcessInfo {
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public:
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ProcessInfo(DWORD process_id, HANDLE process_handle, HANDLE exit_pipe)
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: process_id_(process_id),
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process_handle_(process_handle),
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exit_pipe_(exit_pipe) { }
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~ProcessInfo() {
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BOOL success = CloseHandle(process_handle_);
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if (!success) {
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FATAL("Failed to close process handle");
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}
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success = CloseHandle(exit_pipe_);
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if (!success) {
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FATAL("Failed to close process exit code pipe");
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}
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}
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DWORD pid() { return process_id_; }
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HANDLE process_handle() { return process_handle_; }
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HANDLE exit_pipe() { return exit_pipe_; }
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ProcessInfo* next() { return next_; }
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void set_next(ProcessInfo* next) { next_ = next; }
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private:
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DWORD process_id_; // Process id.
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HANDLE process_handle_; // Process handle.
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HANDLE exit_pipe_; // File descriptor for pipe to report exit code.
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ProcessInfo* next_;
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};
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// Singly-linked list of ProcessInfo objects for all active processes
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// started from Dart.
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class ProcessInfoList {
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public:
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static void AddProcess(DWORD pid, HANDLE handle, HANDLE pipe) {
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MutexLocker locker(&mutex_);
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ProcessInfo* info = new ProcessInfo(pid, handle, pipe);
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info->set_next(active_processes_);
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active_processes_ = info;
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++number_of_processes_;
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BOOL success = SetEvent(GetProcessAddedEvent());
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if (!success) {
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FATAL("Failed to set process added event");
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}
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}
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static bool LookupProcess(DWORD pid, HANDLE* handle, HANDLE* pipe) {
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MutexLocker locker(&mutex_);
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ProcessInfo* current = active_processes_;
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while (current != NULL) {
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if (current->pid() == pid) {
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*handle = current->process_handle();
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*pipe = current->exit_pipe();
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return true;
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}
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current = current->next();
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}
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return false;
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}
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static bool LookupProcessByHandle(HANDLE handle, DWORD* pid, HANDLE* pipe) {
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MutexLocker locker(&mutex_);
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ProcessInfo* current = active_processes_;
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while (current != NULL) {
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if (current->process_handle() == handle) {
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*pid = current->pid();
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*pipe = current->exit_pipe();
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return true;
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}
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current = current->next();
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}
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return false;
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}
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static void RemoveProcess(DWORD pid) {
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MutexLocker locker(&mutex_);
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ProcessInfo* prev = NULL;
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ProcessInfo* current = active_processes_;
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while (current != NULL) {
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if (current->pid() == pid) {
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if (prev == NULL) {
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active_processes_ = current->next();
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} else {
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prev->set_next(current->next());
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}
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delete current;
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--number_of_processes_;
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return;
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}
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prev = current;
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current = current->next();
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}
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}
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// Extract the process handles from the process list. The handles
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// array argument must have space for MAXIMUM_WAIT_OBJECTS handles.
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static DWORD GetHandleArray(HANDLE* handles, intptr_t prefix_size) {
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MutexLocker locker(&mutex_);
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ASSERT(prefix_size >= 0);
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DWORD number_of_handles = prefix_size + number_of_processes_;
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if (number_of_handles > MAXIMUM_WAIT_OBJECTS) {
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FATAL1("Only %d processes supported on Windows at this point\n",
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MAXIMUM_WAIT_OBJECTS - prefix_size);
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}
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intptr_t i = prefix_size;
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ProcessInfo* current = active_processes_;
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while (current != NULL) {
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handles[i++] = current->process_handle();
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current = current->next();
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}
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ASSERT(i == number_of_handles);
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// We have taken a new snapshot of the handles in the list. Reset
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// the process_added_event so we will get signaled if more
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// processes are added.
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BOOL success = ResetEvent(GetProcessAddedEvent());
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if (!success) {
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FATAL("Failed to reset process added event");
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}
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return number_of_handles;
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}
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private:
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friend class ExitCodeHandler;
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static HANDLE GetProcessAddedEvent() {
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MutexLocker locker(&process_added_event_mutex_);
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if (process_added_event_ == INVALID_HANDLE_VALUE) {
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process_added_event_ = CreateEvent(NULL, TRUE, FALSE, NULL);
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if (process_added_event_ == NULL) {
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FATAL("Failed to allocate event for signaling addition of processes");
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}
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}
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return process_added_event_;
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}
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// Number of processes currently in the list.
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static intptr_t number_of_processes_;
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// Linked list of ProcessInfo objects for all active processes
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// started from Dart code.
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static ProcessInfo* active_processes_;
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// Mutex protecting all accesses to the linked list of active
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// processes.
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static dart::Mutex mutex_;
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// Event used to signal that more processes have been added to the
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// list.
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static HANDLE process_added_event_;
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static dart::Mutex process_added_event_mutex_;
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};
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intptr_t ProcessInfoList::number_of_processes_ = 0;
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ProcessInfo* ProcessInfoList::active_processes_ = NULL;
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dart::Mutex ProcessInfoList::mutex_;
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HANDLE ProcessInfoList::process_added_event_ = INVALID_HANDLE_VALUE;
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dart::Mutex ProcessInfoList::process_added_event_mutex_;
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// The exit code handler sets up a separate thread which is waiting
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// for Dart process termination and process start. When a process
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// terminates the exit code is extracted and communicated to Dart
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// through the event loop.
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class ExitCodeHandler {
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public:
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// Ensure that the ExitCodeHandler has been initialized.
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static bool EnsureInitialized() {
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// Multiple isolates could be starting processes at the same
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// time. Make sure that only one of them initializes the
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// ExitCodeHandler.
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MutexLocker locker(&mutex_);
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if (initialized_) {
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return true;
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}
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// Allocate an event object to be signaled when the exit code
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// thread should terminate.
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terminate_event_ = CreateEvent(NULL, TRUE, FALSE, NULL);
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if (terminate_event_ == NULL) {
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return false;
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}
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// Start thread that waits for the process-addition and
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// thread-termination events as well as all process handles for
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// all active processes.
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HANDLE* events = new HANDLE[2];
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events[0] = ProcessInfoList::GetProcessAddedEvent();
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events[1] = terminate_event_;
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int result = dart::Thread::Start(ExitCodeHandlerEntry,
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reinterpret_cast<uword>(events));
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if (result != 0) {
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FATAL1("Failed to start exit code handler thread: %d", result);
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}
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// Thread started and the ExitCodeHandler is initialized.
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initialized_ = true;
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return true;
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}
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static void TerminateExitCodeThread() {
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MutexLocker locker(&mutex_);
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if (!initialized_) {
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return;
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}
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BOOL success = SetEvent(terminate_event_);
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if (!success) {
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FATAL("Failed to set terminate event for exit code handler shutdown");
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}
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{
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MonitorLocker terminate_locker(&thread_terminate_monitor_);
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while (!thread_terminated_) {
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terminate_locker.Wait();
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}
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}
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}
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static void ExitCodeThreadTerminated() {
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MonitorLocker locker(&thread_terminate_monitor_);
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thread_terminated_ = true;
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locker.Notify();
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}
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private:
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// Entry point for the exit code handler thread started by the
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// ExitCodeHandler.
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static void ExitCodeHandlerEntry(uword param) {
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HANDLE* events = reinterpret_cast<HANDLE*>(param);
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HANDLE wake_up_event = events[0];
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HANDLE terminate_event = events[1];
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delete[] events;
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HANDLE handles[MAXIMUM_WAIT_OBJECTS];
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handles[0] = wake_up_event;
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handles[1] = terminate_event;
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while (true) {
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// Get the list of handles to wait for. Allocate a prefix of two
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// extra handles for the 'process added' and 'thread
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// termination' event objects.
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static const intptr_t kPrefixSize = 2;
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DWORD number_of_handles =
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ProcessInfoList::GetHandleArray(handles, kPrefixSize);
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ASSERT(handles[0] == wake_up_event);
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ASSERT(handles[1] == terminate_event);
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// Wait for the handles.
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DWORD result =
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WaitForMultipleObjects(number_of_handles, handles, FALSE, INFINITE);
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if (result == WAIT_FAILED) {
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FATAL("Failed to wait for multiple objects for exit code handling");
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}
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if (result == 0) {
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// If the result is 0 the thread woke up because of process
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// addition. We don't have to do anything we just need to
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// update the list of handles we are waiting for.
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} else if (result == 1) {
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// The termination event was triggered. Free event objects and
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// exit.
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CloseHandle(terminate_event_);
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CloseHandle(wake_up_event);
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ExitCodeThreadTerminated();
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return;
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} else {
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// The result is the index of the process that was
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// signalled. Get its exit code and communicate it to Dart.
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ASSERT(result < number_of_handles);
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int exit_code;
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BOOL ok = GetExitCodeProcess(handles[result],
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reinterpret_cast<DWORD*>(&exit_code));
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if (!ok) {
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FATAL1("GetExitCodeProcess failed %d\n", GetLastError());
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}
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int negative = 0;
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if (exit_code < 0) {
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exit_code = abs(exit_code);
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negative = 1;
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}
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DWORD pid;
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HANDLE exit_pipe;
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bool success = ProcessInfoList::LookupProcessByHandle(handles[result],
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&pid,
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&exit_pipe);
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if (!success) {
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FATAL("Failed to lookup pid and exit pipe from process handle");
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}
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int message[2] = { exit_code, negative };
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DWORD written;
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ok = WriteFile(exit_pipe, message, sizeof(message), &written, NULL);
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// If the process has been closed, the read end of the exit
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// pipe has been closed. It is therefore not a problem that
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// WriteFile fails with a closed pipe error
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// (ERROR_NO_DATA). Other errors should not happen.
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if (ok && written != sizeof(message)) {
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FATAL("Failed to write entire process exit message");
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} else if (!ok && GetLastError() != ERROR_NO_DATA) {
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FATAL1("Failed to write exit code: %d", GetLastError());
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}
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ProcessInfoList::RemoveProcess(pid);
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}
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}
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}
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static dart::Mutex mutex_;
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static bool initialized_;
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static HANDLE terminate_event_;
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static bool thread_terminated_;
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static dart::Monitor thread_terminate_monitor_;
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};
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dart::Mutex ExitCodeHandler::mutex_;
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bool ExitCodeHandler::initialized_ = false;
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HANDLE ExitCodeHandler::terminate_event_ = INVALID_HANDLE_VALUE;
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bool ExitCodeHandler::thread_terminated_ = false;
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dart::Monitor ExitCodeHandler::thread_terminate_monitor_;
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// Types of pipes to create.
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enum NamedPipeType {
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kInheritRead,
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kInheritWrite,
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kInheritNone
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};
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// Create a pipe for communicating with a new process. The handles array
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// will contain the read and write ends of the pipe. Based on the type
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// one of the handles will be inheritable.
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// NOTE: If this function returns false the handles might have been allocated
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// and the caller should make sure to close them in case of an error.
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static bool CreateProcessPipe(HANDLE handles[2],
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char* pipe_name,
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NamedPipeType type) {
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// Security attributes describing an inheritable handle.
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SECURITY_ATTRIBUTES inherit_handle;
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inherit_handle.nLength = sizeof(SECURITY_ATTRIBUTES);
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inherit_handle.bInheritHandle = TRUE;
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inherit_handle.lpSecurityDescriptor = NULL;
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if (type == kInheritRead) {
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handles[kWriteHandle] =
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CreateNamedPipe(pipe_name,
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PIPE_ACCESS_OUTBOUND | FILE_FLAG_OVERLAPPED,
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PIPE_TYPE_BYTE | PIPE_WAIT,
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1, // Number of pipes
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1024, // Out buffer size
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1024, // In buffer size
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0, // Timeout in ms
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NULL);
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if (handles[kWriteHandle] == INVALID_HANDLE_VALUE) {
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fprintf(stderr, "CreateNamedPipe failed %d\n", GetLastError());
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return false;
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}
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handles[kReadHandle] =
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CreateFile(pipe_name,
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GENERIC_READ,
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0,
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&inherit_handle,
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OPEN_EXISTING,
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FILE_READ_ATTRIBUTES | FILE_FLAG_OVERLAPPED,
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NULL);
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if (handles[kReadHandle] == INVALID_HANDLE_VALUE) {
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fprintf(stderr, "CreateFile failed %d\n", GetLastError());
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return false;
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}
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} else {
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ASSERT(type == kInheritWrite || type == kInheritNone);
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handles[kReadHandle] =
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CreateNamedPipe(pipe_name,
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PIPE_ACCESS_INBOUND | FILE_FLAG_OVERLAPPED,
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PIPE_TYPE_BYTE | PIPE_WAIT,
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1, // Number of pipes
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1024, // Out buffer size
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1024, // In buffer size
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0, // Timeout in ms
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NULL);
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if (handles[kReadHandle] == INVALID_HANDLE_VALUE) {
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fprintf(stderr, "CreateNamedPipe failed %d\n", GetLastError());
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return false;
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}
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handles[kWriteHandle] =
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CreateFile(pipe_name,
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GENERIC_WRITE,
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0,
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(type == kInheritWrite) ? &inherit_handle : NULL,
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OPEN_EXISTING,
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FILE_WRITE_ATTRIBUTES | FILE_FLAG_OVERLAPPED,
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NULL);
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if (handles[kWriteHandle] == INVALID_HANDLE_VALUE) {
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fprintf(stderr, "CreateFile failed %d\n", GetLastError());
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return false;
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}
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}
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return true;
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}
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static void CloseProcessPipe(HANDLE handles[2]) {
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for (int i = kReadHandle; i < kWriteHandle; i++) {
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if (handles[i] != INVALID_HANDLE_VALUE) {
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if (!CloseHandle(handles[i])) {
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fprintf(stderr, "CloseHandle failed %d\n", GetLastError());
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}
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handles[i] = INVALID_HANDLE_VALUE;
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}
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}
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}
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static void CloseProcessPipes(HANDLE handles1[2],
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HANDLE handles2[2],
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HANDLE handles3[2],
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HANDLE handles4[2]) {
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CloseProcessPipe(handles1);
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CloseProcessPipe(handles2);
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CloseProcessPipe(handles3);
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CloseProcessPipe(handles4);
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}
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static int SetOsErrorMessage(char* os_error_message,
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int os_error_message_len) {
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int error_code = GetLastError();
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DWORD message_size =
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FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
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NULL,
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error_code,
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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os_error_message,
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os_error_message_len,
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NULL);
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if (message_size == 0) {
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if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
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fprintf(stderr, "FormatMessage failed %d\n", GetLastError());
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}
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snprintf(os_error_message, os_error_message_len, "OS Error %d", error_code);
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}
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os_error_message[os_error_message_len - 1] = '\0';
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return error_code;
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}
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int Process::Start(const char* path,
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char* arguments[],
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intptr_t arguments_length,
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const char* working_directory,
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intptr_t* in,
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intptr_t* out,
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intptr_t* err,
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intptr_t* id,
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intptr_t* exit_handler,
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char* os_error_message,
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int os_error_message_len) {
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// Ensure that the process exit handler thread has been started.
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bool initialized = ExitCodeHandler::EnsureInitialized();
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if (!initialized) {
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int error_code = SetOsErrorMessage(os_error_message, os_error_message_len);
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fprintf(stderr, "Failed to initialize ExitCodeHandler: %d\n", error_code);
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return error_code;
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}
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HANDLE stdin_handles[2] = { INVALID_HANDLE_VALUE, INVALID_HANDLE_VALUE };
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HANDLE stdout_handles[2] = { INVALID_HANDLE_VALUE, INVALID_HANDLE_VALUE };
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HANDLE stderr_handles[2] = { INVALID_HANDLE_VALUE, INVALID_HANDLE_VALUE };
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HANDLE exit_handles[2] = { INVALID_HANDLE_VALUE, INVALID_HANDLE_VALUE };
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// Generate unique pipe names for the four named pipes needed.
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char pipe_names[4][80];
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UUID uuid;
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RPC_STATUS status = UuidCreateSequential(&uuid);
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if (status != RPC_S_OK && status != RPC_S_UUID_LOCAL_ONLY) {
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fprintf(stderr, "UuidCreateSequential failed %d\n", status);
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SetOsErrorMessage(os_error_message, os_error_message_len);
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return status;
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}
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RPC_CSTR uuid_string;
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status = UuidToString(&uuid, &uuid_string);
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if (status != RPC_S_OK) {
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fprintf(stderr, "UuidToString failed %d\n", status);
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SetOsErrorMessage(os_error_message, os_error_message_len);
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return status;
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}
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for (int i = 0; i < 4; i++) {
|
|
static const char* prefix = "\\\\.\\Pipe\\dart";
|
|
snprintf(pipe_names[i],
|
|
sizeof(pipe_names[i]),
|
|
"%s_%s_%d", prefix, uuid_string, i + 1);
|
|
}
|
|
status = RpcStringFree(&uuid_string);
|
|
if (status != RPC_S_OK) {
|
|
fprintf(stderr, "RpcStringFree failed %d\n", status);
|
|
SetOsErrorMessage(os_error_message, os_error_message_len);
|
|
return status;
|
|
}
|
|
|
|
if (!CreateProcessPipe(stdin_handles, pipe_names[0], kInheritRead)) {
|
|
int error_code = SetOsErrorMessage(os_error_message, os_error_message_len);
|
|
CloseProcessPipes(
|
|
stdin_handles, stdout_handles, stderr_handles, exit_handles);
|
|
return error_code;
|
|
}
|
|
if (!CreateProcessPipe(stdout_handles, pipe_names[1], kInheritWrite)) {
|
|
int error_code = SetOsErrorMessage(os_error_message, os_error_message_len);
|
|
CloseProcessPipes(
|
|
stdin_handles, stdout_handles, stderr_handles, exit_handles);
|
|
return error_code;
|
|
}
|
|
if (!CreateProcessPipe(stderr_handles, pipe_names[2], kInheritWrite)) {
|
|
int error_code = SetOsErrorMessage(os_error_message, os_error_message_len);
|
|
CloseProcessPipes(
|
|
stdin_handles, stdout_handles, stderr_handles, exit_handles);
|
|
return error_code;
|
|
}
|
|
if (!CreateProcessPipe(exit_handles, pipe_names[3], kInheritNone)) {
|
|
int error_code = SetOsErrorMessage(os_error_message, os_error_message_len);
|
|
CloseProcessPipes(
|
|
stdin_handles, stdout_handles, stderr_handles, exit_handles);
|
|
return error_code;
|
|
}
|
|
|
|
// Setup info structures.
|
|
STARTUPINFO startup_info;
|
|
ZeroMemory(&startup_info, sizeof(startup_info));
|
|
startup_info.cb = sizeof(startup_info);
|
|
startup_info.hStdInput = stdin_handles[kReadHandle];
|
|
startup_info.hStdOutput = stdout_handles[kWriteHandle];
|
|
startup_info.hStdError = stderr_handles[kWriteHandle];
|
|
startup_info.dwFlags |= STARTF_USESTDHANDLES;
|
|
|
|
PROCESS_INFORMATION process_info;
|
|
ZeroMemory(&process_info, sizeof(process_info));
|
|
|
|
// Compute command-line length.
|
|
int command_line_length = strlen(path);
|
|
for (int i = 0; i < arguments_length; i++) {
|
|
command_line_length += strlen(arguments[i]);
|
|
}
|
|
// Account for two occurrences of '"' around the command, one
|
|
// space per argument and a terminating '\0'.
|
|
command_line_length += 2 + arguments_length + 1;
|
|
static const int kMaxCommandLineLength = 32768;
|
|
if (command_line_length > kMaxCommandLineLength) {
|
|
int error_code = SetOsErrorMessage(os_error_message, os_error_message_len);
|
|
CloseProcessPipes(
|
|
stdin_handles, stdout_handles, stderr_handles, exit_handles);
|
|
return error_code;
|
|
}
|
|
|
|
// Put together command-line string.
|
|
char* command_line = new char[command_line_length];
|
|
int len = 0;
|
|
int remaining = command_line_length;
|
|
int written = snprintf(command_line + len, remaining, "\"%s\"", path);
|
|
len += written;
|
|
remaining -= written;
|
|
ASSERT(remaining >= 0);
|
|
for (int i = 0; i < arguments_length; i++) {
|
|
written = snprintf(command_line + len, remaining, " %s", arguments[i]);
|
|
len += written;
|
|
remaining -= written;
|
|
ASSERT(remaining >= 0);
|
|
}
|
|
|
|
// Create process.
|
|
BOOL result = CreateProcess(NULL, // ApplicationName
|
|
command_line,
|
|
NULL, // ProcessAttributes
|
|
NULL, // ThreadAttributes
|
|
TRUE, // InheritHandles
|
|
0, // CreationFlags
|
|
NULL, // Environment
|
|
working_directory,
|
|
&startup_info,
|
|
&process_info);
|
|
|
|
// Deallocate command-line string.
|
|
delete[] command_line;
|
|
|
|
if (result == 0) {
|
|
int error_code = SetOsErrorMessage(os_error_message, os_error_message_len);
|
|
CloseProcessPipes(
|
|
stdin_handles, stdout_handles, stderr_handles, exit_handles);
|
|
return error_code;
|
|
}
|
|
|
|
ProcessInfoList::AddProcess(process_info.dwProcessId,
|
|
process_info.hProcess,
|
|
exit_handles[kWriteHandle]);
|
|
|
|
// Connect the three std streams.
|
|
FileHandle* stdin_handle = new FileHandle(stdin_handles[kWriteHandle]);
|
|
CloseHandle(stdin_handles[kReadHandle]);
|
|
FileHandle* stdout_handle = new FileHandle(stdout_handles[kReadHandle]);
|
|
CloseHandle(stdout_handles[kWriteHandle]);
|
|
FileHandle* stderr_handle = new FileHandle(stderr_handles[kReadHandle]);
|
|
CloseHandle(stderr_handles[kWriteHandle]);
|
|
FileHandle* exit_handle = new FileHandle(exit_handles[kReadHandle]);
|
|
*in = reinterpret_cast<intptr_t>(stdout_handle);
|
|
*out = reinterpret_cast<intptr_t>(stdin_handle);
|
|
*err = reinterpret_cast<intptr_t>(stderr_handle);
|
|
*exit_handler = reinterpret_cast<intptr_t>(exit_handle);
|
|
|
|
CloseHandle(process_info.hThread);
|
|
|
|
// Return process id.
|
|
*id = process_info.dwProcessId;
|
|
return 0;
|
|
}
|
|
|
|
|
|
bool Process::Kill(intptr_t id) {
|
|
HANDLE process_handle;
|
|
HANDLE exit_pipe;
|
|
bool success =
|
|
ProcessInfoList::LookupProcess(id, &process_handle, &exit_pipe);
|
|
ASSERT(success);
|
|
BOOL result = TerminateProcess(process_handle, -1);
|
|
if (!result) {
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
void Process::TerminateExitCodeHandler() {
|
|
ExitCodeHandler::TerminateExitCodeThread();
|
|
}
|