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 "threads.h"
  24
  25 #include <system_error>
  26
  27
  28 #ifdef _WIN32
  29
  30 #include <limits>
  31
  32 void althrd_setname(const char *name)
  33 {
  34 #if defined(_MSC_VER)
  35 #define MS_VC_EXCEPTION 0x406D1388
  36 #pragma pack(push,8)
  37     struct {
  38         DWORD dwType;     // Must be 0x1000.
  39         LPCSTR szName;    // Pointer to name (in user addr space).
  40         DWORD dwThreadID; // Thread ID (-1=caller thread).
  41         DWORD dwFlags;    // Reserved for future use, must be zero.
  42     } info;
  43 #pragma pack(pop)
  44     info.dwType = 0x1000;
  45     info.szName = name;
  46     info.dwThreadID = ~DWORD{0};
  47     info.dwFlags = 0;
  48
  49     __try {
  50         RaiseException(MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(ULONG_PTR), (ULONG_PTR*)&info);
  51     }
  52     __except(EXCEPTION_CONTINUE_EXECUTION) {
  53     }
  54 #undef MS_VC_EXCEPTION
  55 #else
  56     (void)name;
  57 #endif
  58 }
  59
  60 namespace al {
  61
  62 semaphore::semaphore(unsigned int initial)
  63 {
  64     if(initial > static_cast<unsigned int>(std::numeric_limits<int>::max()))
  65         throw std::system_error(std::make_error_code(std::errc::value_too_large));
  66     mSem = CreateSemaphore(nullptr, initial, std::numeric_limits<int>::max(), nullptr);
  67     if(mSem == nullptr)
  68         throw std::system_error(std::make_error_code(std::errc::resource_unavailable_try_again));
  69 }
  70
  71 semaphore::~semaphore()
  72 { CloseHandle(mSem); }
  73
  74 void semaphore::post()
  75 {
  76     if(!ReleaseSemaphore(mSem, 1, nullptr))
  77         throw std::system_error(std::make_error_code(std::errc::value_too_large));
  78 }
  79
  80 void semaphore::wait() noexcept
  81 { WaitForSingleObject(mSem, INFINITE); }
  82
  83 bool semaphore::try_wait() noexcept
  84 { return WaitForSingleObject(mSem, 0) == WAIT_OBJECT_0; }
  85
  86 } // namespace al
  87
  88 #else
  89
  90 #if defined(HAVE_PTHREAD_SETNAME_NP) || defined(HAVE_PTHREAD_SET_NAME_NP)
  91 #include <pthread.h>
  92 #ifdef HAVE_PTHREAD_NP_H
  93 #include <pthread_np.h>
  94 #endif
  95
  96 void althrd_setname(const char *name)
  97 {
  98 #if defined(HAVE_PTHREAD_SET_NAME_NP)
  99     pthread_set_name_np(pthread_self(), name);
 100 #elif defined(PTHREAD_SETNAME_NP_ONE_PARAM)
 101     pthread_setname_np(name);
 102 #elif defined(PTHREAD_SETNAME_NP_THREE_PARAMS)
 103     pthread_setname_np(pthread_self(), "%s", (void*)name);
 104 #else
 105     pthread_setname_np(pthread_self(), name);
 106 #endif
 107 }
 108
 109 #else
 110
 111 void althrd_setname(const char*) { }
 112 #endif
 113
 114 namespace al {
 115
 116 #ifdef __APPLE__
 117
 118 semaphore::semaphore(unsigned int initial)
 119 {
 120     mSem = dispatch_semaphore_create(initial);
 121     if(!mSem)
 122         throw std::system_error(std::make_error_code(std::errc::resource_unavailable_try_again));
 123 }
 124
 125 semaphore::~semaphore()
 126 { dispatch_release(mSem); }
 127
 128 void semaphore::post()
 129 { dispatch_semaphore_signal(mSem); }
 130
 131 void semaphore::wait() noexcept
 132 { dispatch_semaphore_wait(mSem, DISPATCH_TIME_FOREVER); }
 133
 134 bool semaphore::try_wait() noexcept
 135 { return dispatch_semaphore_wait(mSem, DISPATCH_TIME_NOW) == 0; }
 136
 137 #else /* !__APPLE__ */
 138
 139 #include <cerrno>
 140
 141 semaphore::semaphore(unsigned int initial)
 142 {
 143     if(sem_init(&mSem, 0, initial) != 0)
 144         throw std::system_error(std::make_error_code(std::errc::resource_unavailable_try_again));
 145 }
 146
 147 semaphore::~semaphore()
 148 { sem_destroy(&mSem); }
 149
 150 void semaphore::post()
 151 {
 152     if(sem_post(&mSem) != 0)
 153         throw std::system_error(std::make_error_code(std::errc::value_too_large));
 154 }
 155
 156 void semaphore::wait() noexcept
 157 {
 158     while(sem_wait(&mSem) == -1 && errno == EINTR) {
 159     }
 160 }
 161
 162 bool semaphore::try_wait() noexcept
 163 { return sem_trywait(&mSem) == 0; }
 164
 165 #endif /* __APPLE__ */
 166
 167 } // namespace al
 168
 169 #endif /* _WIN32 */