diff options
Diffstat (limited to 'src/backend/port/posix_sema.c')
| -rw-r--r-- | src/backend/port/posix_sema.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/src/backend/port/posix_sema.c b/src/backend/port/posix_sema.c index 2024b3ebdea..8d951f21837 100644 --- a/src/backend/port/posix_sema.c +++ b/src/backend/port/posix_sema.c @@ -11,7 +11,7 @@ * Portions Copyright (c) 1994, Regents of the University of California * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/port/posix_sema.c,v 1.14 2005/10/15 02:49:22 momjian Exp $ + * $PostgreSQL: pgsql/src/backend/port/posix_sema.c,v 1.14.2.1 2005/11/22 18:23:14 momjian Exp $ * *------------------------------------------------------------------------- */ @@ -246,19 +246,20 @@ PGSemaphoreLock(PGSemaphore sema, bool interruptOK) * from the operation prematurely because we were sent a signal. So we * try and lock the semaphore again. * - * Each time around the loop, we check for a cancel/die interrupt. We assume - * that if such an interrupt comes in while we are waiting, it will cause - * the sem_wait() call to exit with errno == EINTR, so that we will be - * able to service the interrupt (if not in a critical section already). + * Each time around the loop, we check for a cancel/die interrupt. We + * assume that if such an interrupt comes in while we are waiting, it will + * cause the sem_wait() call to exit with errno == EINTR, so that we will + * be able to service the interrupt (if not in a critical section + * already). * * Once we acquire the lock, we do NOT check for an interrupt before * returning. The caller needs to be able to record ownership of the lock * before any interrupt can be accepted. * - * There is a window of a few instructions between CHECK_FOR_INTERRUPTS and - * entering the sem_wait() call. If a cancel/die interrupt occurs in that - * window, we would fail to notice it until after we acquire the lock (or - * get another interrupt to escape the sem_wait()). We can avoid this + * There is a window of a few instructions between CHECK_FOR_INTERRUPTS + * and entering the sem_wait() call. If a cancel/die interrupt occurs in + * that window, we would fail to notice it until after we acquire the lock + * (or get another interrupt to escape the sem_wait()). We can avoid this * problem by temporarily setting ImmediateInterruptOK to true before we * do CHECK_FOR_INTERRUPTS; then, a die() interrupt in this interval will * execute directly. However, there is a huge pitfall: there is another |