166 lines
3.2 KiB
C++
166 lines
3.2 KiB
C++
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// Event.cpp
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// Implements the cEvent object representing an OS-specific synchronization primitive that can be waited-for
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// Implemented as an Event on Win and as a 1-semaphore on *nix
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#include "Globals.h" // NOTE: MSVC stupidness requires this to be the same across all modules
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#include "Event.h"
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cEvent::cEvent(void)
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{
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#ifdef _WIN32
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m_Event = CreateEvent(NULL, FALSE, FALSE, NULL);
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if (m_Event == NULL)
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{
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LOGERROR("cEvent: cannot create event, GLE = %d. Aborting server.", GetLastError());
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abort();
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}
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#else // *nix
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m_bIsNamed = false;
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m_Event = new sem_t;
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if (sem_init(m_Event, 0, 0))
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{
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// This path is used by MacOS, because it doesn't support unnamed semaphores.
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delete m_Event;
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m_bIsNamed = true;
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AString EventName;
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Printf(EventName, "cEvent%p", this);
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m_Event = sem_open(EventName.c_str(), O_CREAT, 777, 0 );
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if (m_Event == SEM_FAILED)
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{
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LOGERROR("cEvent: Cannot create event, errno = %i. Aborting server.", errno);
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abort();
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}
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// Unlink the semaphore immediately - it will continue to function but will not pollute the namespace
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// We don't store the name, so can't call this in the destructor
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if (sem_unlink(EventName.c_str()) != 0)
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{
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LOGWARN("ERROR: Could not unlink cEvent. (%i)", errno);
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}
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}
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#endif // *nix
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}
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cEvent::~cEvent()
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{
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#ifdef _WIN32
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CloseHandle(m_Event);
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#else
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if (m_bIsNamed)
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{
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if (sem_close(m_Event) != 0)
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{
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LOGERROR("ERROR: Could not close cEvent. (%i)", errno);
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}
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}
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else
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{
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sem_destroy(m_Event);
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delete m_Event;
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}
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#endif
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}
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void cEvent::Wait(void)
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{
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#ifdef _WIN32
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DWORD res = WaitForSingleObject(m_Event, INFINITE);
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if (res != WAIT_OBJECT_0)
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{
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LOGWARN("cEvent: waiting for the event failed: %d, GLE = %d. Continuing, but server may be unstable.", res, GetLastError());
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}
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#else
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int res = sem_wait(m_Event);
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if (res != 0 )
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{
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LOGWARN("cEvent: waiting for the event failed: %i, errno = %i. Continuing, but server may be unstable.", res, errno);
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}
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#endif
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}
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void cEvent::Set(void)
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{
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#ifdef _WIN32
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if (!SetEvent(m_Event))
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{
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LOGWARN("cEvent: Could not set cEvent: GLE = %d", GetLastError());
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}
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#else
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int res = sem_post(m_Event);
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if (res != 0)
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{
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LOGWARN("cEvent: Could not set cEvent: %i, errno = %d", res, errno);
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}
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#endif
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}
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cEvent::eWaitResult cEvent::Wait(int a_TimeoutMilliSec)
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{
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#ifdef _WIN32
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DWORD res = WaitForSingleObject(m_Event, (DWORD)a_TimeoutMilliSec);
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switch (res)
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{
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case WAIT_OBJECT_0:
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{
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// The semaphore was signalled
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return wrSignalled;
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}
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case WAIT_TIMEOUT:
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{
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// The timeout was hit
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return wrTimeout;
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}
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default:
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{
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LOGWARNING("cEvent: timed-waiting for the event failed: %d, GLE = %d. Continuing, but server may be unstable.", res, GetLastError());
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return wrError;
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}
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}
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#else
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timespec timeout;
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timeout.tv_sec = a_TimeoutMilliSec / 1000;
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timeout.tv_nsec = (a_TimeoutMilliSec % 1000) * 1000000;
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int res = sem_timedwait(m_Event, &timeout);
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if (res == 0)
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{
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// The semaphore was signalled
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return wrSignalled;
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}
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int err = errno;
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if (err == ETIMEDOUT)
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{
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// The timeout was hit
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return wrTimeout;
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}
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LOGWARNING("cEvent: timed-waiting for the event failed: %i, errno = %i. Continuing, but server may be unstable.", res, err);
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return wrError;
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#endif
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}
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