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72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
/*-------------------------------------------------------------------------
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*
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* timer.c
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* Microsoft Windows Win32 Timer Implementation
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*
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* Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/port/win32/timer.c,v 1.4 2004/08/29 05:06:46 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "libpq/pqsignal.h"
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static HANDLE timerHandle = INVALID_HANDLE_VALUE;
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static VOID CALLBACK
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timer_completion(LPVOID arg, DWORD timeLow, DWORD timeHigh)
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{
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pg_queue_signal(SIGALRM);
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}
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/*
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* Limitations of this implementation:
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*
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* - Does not support setting ovalue
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* - Does not support interval timer (value->it_interval)
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* - Only supports ITIMER_REAL
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*/
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int
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setitimer(int which, const struct itimerval * value, struct itimerval * ovalue)
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{
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LARGE_INTEGER dueTime;
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Assert(ovalue == NULL);
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Assert(value != NULL);
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Assert(value->it_interval.tv_sec == 0 && value->it_interval.tv_usec == 0);
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Assert(which == ITIMER_REAL);
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if (timerHandle == INVALID_HANDLE_VALUE)
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{
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/* First call in this backend, create new timer object */
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timerHandle = CreateWaitableTimer(NULL, TRUE, NULL);
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if (timerHandle == NULL)
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ereport(FATAL,
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(errmsg_internal("failed to create waitable timer: %i", (int) GetLastError())));
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}
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if (value->it_value.tv_sec == 0 &&
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value->it_value.tv_usec == 0)
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{
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/* Turn timer off */
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CancelWaitableTimer(timerHandle);
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return 0;
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}
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/* Negative time to SetWaitableTimer means relative time */
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dueTime.QuadPart = -(value->it_value.tv_usec * 10 + value->it_value.tv_sec * 10000000L);
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/* Turn timer on, or change timer */
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if (!SetWaitableTimer(timerHandle, &dueTime, 0, timer_completion, NULL, FALSE))
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ereport(FATAL,
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(errmsg_internal("failed to set waitable timer: %i", (int) GetLastError())));
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return 0;
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}
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