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avoid all malloc/free in timer creation/destruction

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instead of allocating a userspace structure for signal-based timers,
simply use the kernel timer id. we use the fact that thread pointers
will always be zero in the low bit (actually more) to encode integer
timerid values as pointers.

also, this change ensures that the timer_destroy syscall has completed
before the library timer_destroy function returns, in case it matters.
This commit is contained in:
Rich Felker 2011-03-30 13:04:55 -04:00
commit 3990c5c6a4
7 changed files with 22 additions and 31 deletions
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13
src/time/timer_delete.c
View file

@ -3,10 +3,11 @@
int timer_delete(timer_t t)
{
if (t->thread) pthread_cancel(t->thread);
else {
__syscall(SYS_timer_delete, t->timerid);
free(t);
}
return 0;
pthread_t td = 0;
int r;
if ((uintptr_t)t & 1) t = (void *)((unsigned long)t / 2);
else td = t, t = td->result;
r = __syscall(SYS_timer_delete, (long)t);
if (td) pthread_cancel(td);
return r;
}