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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <assert.h>
#include <new.h>
#include <process.h>
#include <windows.h>
#include "threading/Thread.h"
class js::Thread::Id::PlatformData
{
friend class js::Thread;
friend js::Thread::Id js::ThisThread::GetId();
HANDLE handle;
unsigned id;
};
/* static */ js::HashNumber
js::Thread::Hasher::hash(const Lookup& l)
{
return mozilla::HashBytes(l.platformData_, sizeof(l.platformData_));
}
inline js::Thread::Id::PlatformData*
js::Thread::Id::platformData()
{
static_assert(sizeof platformData_ >= sizeof(PlatformData),
"platformData_ is too small");
return reinterpret_cast<PlatformData*>(platformData_);
}
inline const js::Thread::Id::PlatformData*
js::Thread::Id::platformData() const
{
static_assert(sizeof platformData_ >= sizeof(PlatformData),
"platformData_ is too small");
return reinterpret_cast<const PlatformData*>(platformData_);
}
js::Thread::Id::Id()
{
platformData()->handle = nullptr;
platformData()->id = 0;
}
bool
js::Thread::Id::operator==(const Id& aOther) const
{
return platformData()->id == aOther.platformData()->id;
}
js::Thread::Thread(Thread&& aOther)
{
id_ = aOther.id_;
aOther.id_ = Id();
}
js::Thread&
js::Thread::operator=(Thread&& aOther)
{
MOZ_RELEASE_ASSERT(!joinable());
id_ = aOther.id_;
aOther.id_ = Id();
return *this;
}
bool
js::Thread::create(unsigned int (__stdcall* aMain)(void*), void* aArg)
{
// Use _beginthreadex and not CreateThread, because threads that are
// created with the latter leak a small amount of memory when they use
// certain msvcrt functions and then exit.
uintptr_t handle = _beginthreadex(nullptr, options_.stackSize(),
aMain, aArg,
STACK_SIZE_PARAM_IS_A_RESERVATION,
&id_.platformData()->id);
if (!handle) {
// The documentation does not say what state the thread id has if the method
// fails, so assume that it is undefined and reset it manually.
id_ = Id();
return false;
}
id_.platformData()->handle = reinterpret_cast<HANDLE>(handle);
return true;
}
void
js::Thread::join()
{
MOZ_RELEASE_ASSERT(joinable());
DWORD r = WaitForSingleObject(id_.platformData()->handle, INFINITE);
MOZ_RELEASE_ASSERT(r == WAIT_OBJECT_0);
BOOL success = CloseHandle(id_.platformData()->handle);
MOZ_RELEASE_ASSERT(success);
id_ = Id();
}
void
js::Thread::detach()
{
MOZ_RELEASE_ASSERT(joinable());
BOOL success = CloseHandle(id_.platformData()->handle);
MOZ_RELEASE_ASSERT(success);
id_ = Id();
}
js::Thread::Id
js::ThisThread::GetId()
{
js::Thread::Id id;
id.platformData()->handle = GetCurrentThread();
id.platformData()->id = GetCurrentThreadId();
MOZ_RELEASE_ASSERT(id != js::Thread::Id());
return id;
}
void
js::ThisThread::SetName(const char* name)
{
MOZ_RELEASE_ASSERT(name);
#ifdef _MSC_VER
// Setting the thread name requires compiler support for structured
// exceptions, so this only works when compiled with MSVC.
static const DWORD THREAD_NAME_EXCEPTION = 0x406D1388;
static const DWORD THREAD_NAME_INFO_TYPE = 0x1000;
#pragma pack(push, 8)
struct THREADNAME_INFO
{
DWORD dwType;
LPCSTR szName;
DWORD dwThreadID;
DWORD dwFlags;
};
#pragma pack(pop)
THREADNAME_INFO info;
info.dwType = THREAD_NAME_INFO_TYPE;
info.szName = name;
info.dwThreadID = GetCurrentThreadId();
info.dwFlags = 0;
__try {
RaiseException(THREAD_NAME_EXCEPTION, 0, sizeof(info) / sizeof(ULONG_PTR),
(ULONG_PTR*)&info);
} __except (EXCEPTION_EXECUTE_HANDLER) {
// Do nothing.
}
#endif
}
void
js::ThisThread::GetName(char* nameBuffer, size_t len)
{
MOZ_RELEASE_ASSERT(len > 0);
*nameBuffer = '\0';
}
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