common/alsem.h

   1 #ifndef COMMON_ALSEM_H
   2 #define COMMON_ALSEM_H
   3
   4 #if defined(__APPLE__)
   5 #include <AvailabilityMacros.h>
   6 #include <TargetConditionals.h>
   7 #if (((MAC_OS_X_VERSION_MIN_REQUIRED > 1050) && !defined(__ppc__)) || TARGET_OS_IOS || TARGET_OS_TV)
   8 #include <dispatch/dispatch.h>
   9 #define AL_APPLE_HAVE_DISPATCH 1
  10 #else
  11 #include <semaphore.h> /* Fallback option for Apple without a working libdispatch */
  12 #endif
  13 #elif !defined(_WIN32)
  14 #include <semaphore.h>
  15 #endif
  16
  17 namespace al {
  18
  19 class semaphore {
  20 #ifdef _WIN32
  21     using native_type = void*;
  22 #elif defined(AL_APPLE_HAVE_DISPATCH)
  23     using native_type = dispatch_semaphore_t;
  24 #else
  25     using native_type = sem_t;
  26 #endif
  27     native_type mSem{};
  28
  29 public:
  30     semaphore(unsigned int initial=0);
  31     semaphore(const semaphore&) = delete;
  32     ~semaphore();
  33
  34     semaphore& operator=(const semaphore&) = delete;
  35
  36     void post();
  37     void wait() noexcept;
  38     bool try_wait() noexcept;
  39 };
  40
  41 } // namespace al
  42
  43 #endif /* COMMON_ALSEM_H */