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further debloat cancellation handlers

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cleanup push and pop are also no-ops if pthread_exit is not reachable.
this can make a big difference for library code which needs to protect
itself against cancellation, but which is unlikely to actually be used
in programs with threads/cancellation.
This commit is contained in:
Rich Felker
2011-08-03 19:57:46 -04:00
parent 56385dd5fe
commit 5f37fc132a
4 changed files with 30 additions and 17 deletions
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18
src/thread/cancellation.c
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@ -1,18 +1,11 @@
#include "pthread_impl.h"
#ifdef __pthread_register_cancel
#undef __pthread_register_cancel
#undef __pthread_unregister_cancel
#undef __pthread_unwind_next
#define __pthread_register_cancel __pthread_register_cancel_3
#define __pthread_unregister_cancel __pthread_unregister_cancel_3
#define __pthread_unwind_next __pthread_unwind_next_3
#endif
static void dummy(struct __ptcb *cb)
{
}
weak_alias(dummy, __pthread_do_unwind);
weak_alias(dummy, __pthread_do_register);
weak_alias(dummy, __pthread_do_unregister);
void __pthread_unwind_next(struct __ptcb *cb)
{
@ -21,13 +14,10 @@ void __pthread_unwind_next(struct __ptcb *cb)
void __pthread_register_cancel(struct __ptcb *cb)
{
struct pthread *self = pthread_self();
cb->__next = self->cancelbuf;
self->cancelbuf = cb;
__pthread_do_register(cb);
}
void __pthread_unregister_cancel(struct __ptcb *cb)
{
struct pthread *self = __pthread_self();
self->cancelbuf = self->cancelbuf->__next;
__pthread_do_unregister(cb);
}