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Switch to QueueUserAPC for shutting down the thread (no event needed).

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Also actually specifying the reserve stack size.

BUG=
R=pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/37179004

Cr-Commit-Position: refs/heads/master@{#8331}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8331 4adac7df-926f-26a2-2b94-8c16560cd09d
This commit is contained in:
tommi@webrtc.org 2015-02-11 14:16:08 +00:00
parent fddeaf5daa
commit 9d94a0c736
2 changed files with 21 additions and 8 deletions
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27
webrtc/system_wrappers/source/thread_win.cc
View File

@ -19,23 +19,26 @@
#include "webrtc/system_wrappers/source/set_thread_name_win.h"
namespace webrtc {
namespace {
void CALLBACK RaiseFlag(ULONG_PTR param) {
*reinterpret_cast<bool*>(param) = true;
}
}
ThreadWindows::ThreadWindows(ThreadRunFunction func, ThreadObj obj,
ThreadPriority prio, const char* thread_name)
: run_function_(func),
obj_(obj),
prio_(prio),
event_(CreateEvent(NULL, FALSE, FALSE, NULL)),
stop_(false),
thread_(NULL),
name_(thread_name ? thread_name : "webrtc") {
DCHECK(func);
DCHECK(event_);
}
ThreadWindows::~ThreadWindows() {
DCHECK(main_thread_.CalledOnValidThread());
DCHECK(!thread_);
CloseHandle(event_);
}
// static
@ -53,9 +56,13 @@ bool ThreadWindows::Start(unsigned int& id) {
DCHECK(main_thread_.CalledOnValidThread());
DCHECK(!thread_);
// See bug 2902 for stack size.
stop_ = false;
// See bug 2902 for background on STACK_SIZE_PARAM_IS_A_RESERVATION.
// Set the reserved stack stack size to 1M, which is the default on Windows
// and Linux.
DWORD thread_id;
thread_ = ::CreateThread(NULL, 0, &StartThread, this,
thread_ = ::CreateThread(NULL, 1024 * 1024, &StartThread, this,
STACK_SIZE_PARAM_IS_A_RESERVATION, &thread_id);
if (!thread_ ) {
DCHECK(false) << "CreateThread failed";
@ -92,7 +99,8 @@ bool ThreadWindows::Start(unsigned int& id) {
bool ThreadWindows::Stop() {
DCHECK(main_thread_.CalledOnValidThread());
if (thread_) {
SetEvent(event_);
// Set stop_ to |true| on the worker thread.
QueueUserAPC(&RaiseFlag, thread_, reinterpret_cast<ULONG_PTR>(&stop_));
WaitForSingleObject(thread_, INFINITE);
CloseHandle(thread_);
thread_ = nullptr;
@ -106,9 +114,14 @@ void ThreadWindows::Run() {
SetThreadName(static_cast<DWORD>(-1), name_.c_str());
do {
// The interface contract of Start/Stop is that for a successfull call to
// Start, there should be at least one call to the run function. So we
// call the function before checking |stop_|.
if (!run_function_(obj_))
break;
} while (WaitForSingleObject(event_, 0) == WAIT_TIMEOUT);
// Alertable sleep to permit RaiseFlag to run and update |stop_|.
SleepEx(0, true);
} while (!stop_);
}
} // namespace webrtc

2
webrtc/system_wrappers/source/thread_win.h
View File

@ -36,7 +36,7 @@ class ThreadWindows : public ThreadWrapper {
ThreadRunFunction const run_function_;
void* const obj_;
HANDLE event_; // Used to signal stoppage.
bool stop_;
// TODO(tommi): Consider having a SetPriority method instead of this variable.
ThreadPriority prio_;
HANDLE thread_;