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new framework to inhibit thread cancellation when needed

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with these small changes, libc functions which need to call functions
which are cancellation points, but which themselves must not be
cancellation points, can use the CANCELPT_INHIBIT and CANCELPT_RESUME
macros to temporarily inhibit all cancellation.
This commit is contained in:
Rich Felker
2011-04-05 18:00:28 -04:00
parent 918a40f257
commit 729cb49f52
3 changed files with 17 additions and 5 deletions
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16
src/thread/pthread_create.c
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@ -57,9 +57,19 @@ static void cancel_handler(int sig, siginfo_t *si, void *ctx)
static void cancelpt(int x)
{
struct pthread *self = __pthread_self();
if (self->canceldisable) return;
if ((self->cancelpoint+=x)==1 && x>=0 && self->cancel)
docancel(self);
switch (x) {
case 1:
self->cancelpoint++;
case 0:
if (self->cancel && self->cancelpoint==1 && !self->canceldisable)
docancel(self);
break;
case -1:
self->cancelpoint--;
break;
default:
self->canceldisable += x;
}
}
/* "rsyscall" is a mechanism by which a thread can synchronously force all