source/core/windows/semaphore.cpp

   1 #include <windows.h>
   2 #include <msp/core/systemerror.h>
   3 #include <msp/time/units.h>
   4 #include "semaphore.h"
   5
   6 namespace Msp {
   7
   8 struct Semaphore::Private
   9 {
  10         HANDLE handle;
  11 };
  12
  13
  14 Semaphore::Semaphore(unsigned limit):
  15         priv(new Private)
  16 {
  17         priv->handle = CreateSemaphore(0, 0, limit, 0);
  18 }
  19
  20 Semaphore::~Semaphore()
  21 {
  22         CloseHandle(priv->handle);
  23         delete priv;
  24 }
  25
  26 void Semaphore::signal()
  27 {
  28         if(!ReleaseSemaphore(priv->handle, 1, 0))
  29                 throw system_error("ReleaseSemaphore");
  30 }
  31
  32 void Semaphore::wait()
  33 {
  34         DWORD ret = WaitForSingleObject(priv->handle, INFINITE);
  35         if(ret==WAIT_FAILED)
  36                 throw system_error("WaitForSingleObject");
  37 }
  38
  39 bool Semaphore::wait(const Time::TimeDelta &d)
  40 {
  41         DWORD ret = WaitForSingleObject(priv->handle, (DWORD)(d/Time::usec));
  42         if(ret==WAIT_FAILED)
  43                 throw system_error("WaitForSingleObject");
  44         return ret==WAIT_OBJECT_0;
  45 }
  46
  47 } // namespace Msp