diff options
| author | Daniel Drake <drake@endlessm.com> | 2015-05-12 16:39:22 -0600 |
|---|---|---|
| committer | Adam Jackson <ajax@redhat.com> | 2015-09-21 10:41:46 -0400 |
| commit | 94ab7455abc213fc96760e29ab2e943ec682fb22 (patch) | |
| tree | 439214fad86912d8a9fa23700eafa192e01482aa /os | |
| parent | 58d54ee82dfae5486bc09d04d2760c922d54d631 (diff) | |
Allow system call restarts upon signal interruption
The X server frequently deals with SIGIO and SIGALRM interruptions.
If process execution is inside certain blocking system calls
when these signals arrive, e.g. with the kernel blocked on
a contended semaphore, the system calls will be interrupted.
Some system calls are automatically restartable (the kernel re-executes
them with the same parameters once the signal handler returns) but
only if the signal handler allows it.
Set SA_RESTART on the signal handlers to enable this convenient
behaviour.
Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Daniel Drake <drake@endlessm.com>
Diffstat (limited to 'os')
| -rw-r--r-- | os/utils.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/os/utils.c b/os/utils.c index 868eb043a..9b6fb3081 100644 --- a/os/utils.c +++ b/os/utils.c @@ -1255,6 +1255,7 @@ SmartScheduleInit(void) memset((char *) &act, 0, sizeof(struct sigaction)); /* Set up the timer signal function */ + act.sa_flags = SA_RESTART; act.sa_handler = SmartScheduleTimer; sigemptyset(&act.sa_mask); sigaddset(&act.sa_mask, SIGALRM); |