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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 "mozilla/Assertions.h"
#include <new>
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#if defined(__APPLE__) && defined(__MACH__)
#include <dlfcn.h>
#endif
#if defined(__DragonFly__) || defined(__FreeBSD__) || defined(__OpenBSD__)
#include <pthread_np.h>
#endif
#if defined(__linux__)
#include <sys/prctl.h>
#endif
#include "threading/Thread.h"
class js::Thread::Id::PlatformData
{
friend class js::Thread;
friend js::Thread::Id js::ThisThread::GetId();
pthread_t ptThread;
// pthread_t does not have a default initializer, so we have to carry a bool
// to tell whether it is safe to compare or not.
bool hasThread;
};
/* static */ js::HashNumber
js::Thread::Hasher::hash(const Lookup& l)
{
return mozilla::HashBytes(&l.platformData()->ptThread, sizeof(pthread_t));
}
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()->hasThread = false;
}
bool
js::Thread::Id::operator==(const Id& aOther) const
{
const PlatformData& self = *platformData();
const PlatformData& other = *aOther.platformData();
return (!self.hasThread && !other.hasThread) ||
(self.hasThread == other.hasThread &&
pthread_equal(self.ptThread, other.ptThread));
}
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(void* (*aMain)(void*), void* aArg)
{
pthread_attr_t attrs;
int r = pthread_attr_init(&attrs);
MOZ_RELEASE_ASSERT(!r);
if (options_.stackSize()) {
r = pthread_attr_setstacksize(&attrs, options_.stackSize());
MOZ_RELEASE_ASSERT(!r);
}
r = pthread_create(&id_.platformData()->ptThread, &attrs, aMain, aArg);
if (r) {
// |pthread_create| may leave id_ in an undefined state.
id_ = Id();
return false;
}
id_.platformData()->hasThread = true;
return true;
}
void
js::Thread::join()
{
MOZ_RELEASE_ASSERT(joinable());
int r = pthread_join(id_.platformData()->ptThread, nullptr);
MOZ_RELEASE_ASSERT(!r);
id_ = Id();
}
void
js::Thread::detach()
{
MOZ_RELEASE_ASSERT(joinable());
int r = pthread_detach(id_.platformData()->ptThread);
MOZ_RELEASE_ASSERT(!r);
id_ = Id();
}
js::Thread::Id
js::ThisThread::GetId()
{
js::Thread::Id id;
id.platformData()->ptThread = pthread_self();
id.platformData()->hasThread = true;
return id;
}
void
js::ThisThread::SetName(const char* name)
{
MOZ_RELEASE_ASSERT(name);
#if (defined(__APPLE__) && defined(__MACH__)) || defined(__linux__)
// On linux and OS X the name may not be longer than 16 bytes, including
// the null terminator. Truncate the name to 15 characters.
char nameBuf[16];
strncpy(nameBuf, name, sizeof nameBuf - 1);
nameBuf[sizeof nameBuf - 1] = '\0';
name = nameBuf;
#endif
int rv;
#ifdef XP_DARWIN
rv = pthread_setname_np(name);
#elif defined(__DragonFly__) || defined(__FreeBSD__) || defined(__OpenBSD__)
pthread_set_name_np(pthread_self(), name);
rv = 0;
#elif defined(__NetBSD__)
rv = pthread_setname_np(pthread_self(), "%s", (void*)name);
#else
rv = pthread_setname_np(pthread_self(), name);
#endif
MOZ_RELEASE_ASSERT(!rv);
}
void
js::ThisThread::GetName(char* nameBuffer, size_t len)
{
MOZ_RELEASE_ASSERT(len >= 16);
int rv = -1;
#ifdef HAVE_PTHREAD_GETNAME_NP
rv = pthread_getname_np(pthread_self(), nameBuffer, len);
#elif defined(__linux__)
rv = prctl(PR_GET_NAME, reinterpret_cast<unsigned long>(nameBuffer));
#endif
if (rv)
nameBuffer[0] = '\0';
}
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