common/threads.cpp

   1 /**
   2  * OpenAL cross platform audio library
   3  * Copyright (C) 1999-2007 by authors.
   4  * This library is free software; you can redistribute it and/or
   5  *  modify it under the terms of the GNU Library General Public
   6  *  License as published by the Free Software Foundation; either
   7  *  version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  *  Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public
  15  *  License along with this library; if not, write to the
  16  *  Free Software Foundation, Inc.,
  17  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  * Or go to http://www.gnu.org/copyleft/lgpl.html
  19  */
  20
  21 #include "config.h"
  22
  23 #include "opthelpers.h"
  24 #include "threads.h"
  25
  26 #include <system_error>
  27
  28
  29 #ifdef _WIN32
  30 #define WIN32_LEAN_AND_MEAN
  31 #include <windows.h>
  32
  33 #include <limits>
  34
  35 void althrd_setname(const char *name)
  36 {
  37 #if defined(_MSC_VER)
  38 #define MS_VC_EXCEPTION 0x406D1388
  39 #pragma pack(push,8)
  40     struct {
  41         DWORD dwType;     // Must be 0x1000.
  42         LPCSTR szName;    // Pointer to name (in user addr space).
  43         DWORD dwThreadID; // Thread ID (-1=caller thread).
  44         DWORD dwFlags;    // Reserved for future use, must be zero.
  45     } info;
  46 #pragma pack(pop)
  47     info.dwType = 0x1000;
  48     info.szName = name;
  49     info.dwThreadID = ~DWORD{0};
  50     info.dwFlags = 0;
  51
  52     __try {
  53         RaiseException(MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(ULONG_PTR), (ULONG_PTR*)&info);
  54     }
  55     __except(EXCEPTION_CONTINUE_EXECUTION) {
  56     }
  57 #undef MS_VC_EXCEPTION
  58 #else
  59     (void)name;
  60 #endif
  61 }
  62
  63 namespace al {
  64
  65 semaphore::semaphore(unsigned int initial)
  66 {
  67     if(initial > static_cast<unsigned int>(std::numeric_limits<int>::max()))
  68         throw std::system_error(std::make_error_code(std::errc::value_too_large));
  69     mSem = CreateSemaphore(nullptr, initial, std::numeric_limits<int>::max(), nullptr);
  70     if(mSem == nullptr)
  71         throw std::system_error(std::make_error_code(std::errc::resource_unavailable_try_again));
  72 }
  73
  74 semaphore::~semaphore()
  75 { CloseHandle(mSem); }
  76
  77 void semaphore::post()
  78 {
  79     if UNLIKELY(!ReleaseSemaphore(static_cast<HANDLE>(mSem), 1, nullptr))
  80         throw std::system_error(std::make_error_code(std::errc::value_too_large));
  81 }
  82
  83 void semaphore::wait() noexcept
  84 { WaitForSingleObject(static_cast<HANDLE>(mSem), INFINITE); }
  85
  86 bool semaphore::try_wait() noexcept
  87 { return WaitForSingleObject(static_cast<HANDLE>(mSem), 0) == WAIT_OBJECT_0; }
  88
  89 } // namespace al
  90
  91 #else
  92
  93 #if defined(HAVE_PTHREAD_SETNAME_NP) || defined(HAVE_PTHREAD_SET_NAME_NP)
  94 #include <pthread.h>
  95 #ifdef HAVE_PTHREAD_NP_H
  96 #include <pthread_np.h>
  97 #endif
  98
  99 void althrd_setname(const char *name)
 100 {
 101 #if defined(HAVE_PTHREAD_SET_NAME_NP)
 102     pthread_set_name_np(pthread_self(), name);
 103 #elif defined(PTHREAD_SETNAME_NP_ONE_PARAM)
 104     pthread_setname_np(name);
 105 #elif defined(PTHREAD_SETNAME_NP_THREE_PARAMS)
 106     pthread_setname_np(pthread_self(), "%s", (void*)name);
 107 #else
 108     pthread_setname_np(pthread_self(), name);
 109 #endif
 110 }
 111
 112 #else
 113
 114 void althrd_setname(const char*) { }
 115 #endif
 116
 117 #ifdef __APPLE__
 118
 119 namespace al {
 120
 121 semaphore::semaphore(unsigned int initial)
 122 {
 123     mSem = dispatch_semaphore_create(initial);
 124     if(!mSem)
 125         throw std::system_error(std::make_error_code(std::errc::resource_unavailable_try_again));
 126 }
 127
 128 semaphore::~semaphore()
 129 { dispatch_release(mSem); }
 130
 131 void semaphore::post()
 132 { dispatch_semaphore_signal(mSem); }
 133
 134 void semaphore::wait() noexcept
 135 { dispatch_semaphore_wait(mSem, DISPATCH_TIME_FOREVER); }
 136
 137 bool semaphore::try_wait() noexcept
 138 { return dispatch_semaphore_wait(mSem, DISPATCH_TIME_NOW) == 0; }
 139
 140 } // namespace al
 141
 142 #else /* !__APPLE__ */
 143
 144 #include <cerrno>
 145
 146 namespace al {
 147
 148 semaphore::semaphore(unsigned int initial)
 149 {
 150     if(sem_init(&mSem, 0, initial) != 0)
 151         throw std::system_error(std::make_error_code(std::errc::resource_unavailable_try_again));
 152 }
 153
 154 semaphore::~semaphore()
 155 { sem_destroy(&mSem); }
 156
 157 void semaphore::post()
 158 {
 159     if(sem_post(&mSem) != 0)
 160         throw std::system_error(std::make_error_code(std::errc::value_too_large));
 161 }
 162
 163 void semaphore::wait() noexcept
 164 {
 165     while(sem_wait(&mSem) == -1 && errno == EINTR) {
 166     }
 167 }
 168
 169 bool semaphore::try_wait() noexcept
 170 { return sem_trywait(&mSem) == 0; }
 171
 172 } // namespace al
 173
 174 #endif /* __APPLE__ */
 175
 176 #endif /* _WIN32 */