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/**
* OpenAL cross platform audio library
* Copyright (C) 1999-2007 by authors.
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
* Or go to http://www.gnu.org/copyleft/lgpl.html
*/
#include "config.h"
#include "opthelpers.h"
#include "threads.h"
#include <system_error>
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <limits>
void althrd_setname(const char *name)
{
#if defined(_MSC_VER) && !defined(_M_ARM)
#define MS_VC_EXCEPTION 0x406D1388
#pragma pack(push,8)
struct {
DWORD dwType; // Must be 0x1000.
LPCSTR szName; // Pointer to name (in user addr space).
DWORD dwThreadID; // Thread ID (-1=caller thread).
DWORD dwFlags; // Reserved for future use, must be zero.
} info;
#pragma pack(pop)
info.dwType = 0x1000;
info.szName = name;
info.dwThreadID = ~DWORD{0};
info.dwFlags = 0;
__try {
RaiseException(MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(ULONG_PTR), (ULONG_PTR*)&info);
}
__except(EXCEPTION_CONTINUE_EXECUTION) {
}
#undef MS_VC_EXCEPTION
#else
(void)name;
#endif
}
namespace al {
semaphore::semaphore(unsigned int initial)
{
if(initial > static_cast<unsigned int>(std::numeric_limits<int>::max()))
throw std::system_error(std::make_error_code(std::errc::value_too_large));
mSem = CreateSemaphore(nullptr, initial, std::numeric_limits<int>::max(), nullptr);
if(mSem == nullptr)
throw std::system_error(std::make_error_code(std::errc::resource_unavailable_try_again));
}
semaphore::~semaphore()
{ CloseHandle(mSem); }
void semaphore::post()
{
if(!ReleaseSemaphore(static_cast<HANDLE>(mSem), 1, nullptr))
throw std::system_error(std::make_error_code(std::errc::value_too_large));
}
void semaphore::wait() noexcept
{ WaitForSingleObject(static_cast<HANDLE>(mSem), INFINITE); }
bool semaphore::try_wait() noexcept
{ return WaitForSingleObject(static_cast<HANDLE>(mSem), 0) == WAIT_OBJECT_0; }
} // namespace al
#else
#include <pthread.h>
#ifdef HAVE_PTHREAD_NP_H
#include <pthread_np.h>
#endif
#include <tuple>
namespace {
using setname_t1 = int(*)(const char*);
using setname_t2 = int(*)(pthread_t, const char*);
using setname_t3 = void(*)(pthread_t, const char*);
using setname_t4 = int(*)(pthread_t, const char*, void*);
void setname_caller(setname_t1 func, const char *name)
{ func(name); }
void setname_caller(setname_t2 func, const char *name)
{ func(pthread_self(), name); }
void setname_caller(setname_t3 func, const char *name)
{ func(pthread_self(), name); }
void setname_caller(setname_t4 func, const char *name)
{ func(pthread_self(), "%s", static_cast<void*>(const_cast<char*>(name))); }
} // namespace
void althrd_setname(const char *name)
{
#if defined(HAVE_PTHREAD_SET_NAME_NP)
setname_caller(pthread_set_name_np, name);
#elif defined(HAVE_PTHREAD_SETNAME_NP)
setname_caller(pthread_setname_np, name);
#endif
/* Avoid unused function/parameter warnings. */
std::ignore = name;
std::ignore = static_cast<void(*)(setname_t1,const char*)>(&setname_caller);
std::ignore = static_cast<void(*)(setname_t2,const char*)>(&setname_caller);
std::ignore = static_cast<void(*)(setname_t3,const char*)>(&setname_caller);
std::ignore = static_cast<void(*)(setname_t4,const char*)>(&setname_caller);
}
#ifdef __APPLE__
namespace al {
semaphore::semaphore(unsigned int initial)
{
mSem = dispatch_semaphore_create(initial);
if(!mSem)
throw std::system_error(std::make_error_code(std::errc::resource_unavailable_try_again));
}
semaphore::~semaphore()
{ dispatch_release(mSem); }
void semaphore::post()
{ dispatch_semaphore_signal(mSem); }
void semaphore::wait() noexcept
{ dispatch_semaphore_wait(mSem, DISPATCH_TIME_FOREVER); }
bool semaphore::try_wait() noexcept
{ return dispatch_semaphore_wait(mSem, DISPATCH_TIME_NOW) == 0; }
} // namespace al
#else /* !__APPLE__ */
#include <cerrno>
namespace al {
semaphore::semaphore(unsigned int initial)
{
if(sem_init(&mSem, 0, initial) != 0)
throw std::system_error(std::make_error_code(std::errc::resource_unavailable_try_again));
}
semaphore::~semaphore()
{ sem_destroy(&mSem); }
void semaphore::post()
{
if(sem_post(&mSem) != 0)
throw std::system_error(std::make_error_code(std::errc::value_too_large));
}
void semaphore::wait() noexcept
{
while(sem_wait(&mSem) == -1 && errno == EINTR) {
}
}
bool semaphore::try_wait() noexcept
{ return sem_trywait(&mSem) == 0; }
} // namespace al
#endif /* __APPLE__ */
#endif /* _WIN32 */
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