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