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major improvements to cancellation handling
[musl]
/
src
/
thread
/
pthread_create.c
diff --git
a/src/thread/pthread_create.c
b/src/thread/pthread_create.c
index
17a47f6
..
18ee64d
100644
(file)
--- a/
src/thread/pthread_create.c
+++ b/
src/thread/pthread_create.c
@@
-1,5
+1,10
@@
#include "pthread_impl.h"
#include "pthread_impl.h"
+#ifdef __pthread_unwind_next
+#undef __pthread_unwind_next
+#define __pthread_unwind_next __pthread_unwind_next_3
+#endif
+
void __pthread_unwind_next(struct __ptcb *cb)
{
int i, j, not_finished;
void __pthread_unwind_next(struct __ptcb *cb)
{
int i, j, not_finished;
@@
-42,25
+47,30
@@
void __pthread_unwind_next(struct __ptcb *cb)
static void docancel(struct pthread *self)
{
struct __ptcb cb = { .__next = self->cancelbuf };
static void docancel(struct pthread *self)
{
struct __ptcb cb = { .__next = self->cancelbuf };
+ self->canceldisable = 1;
+ self->cancelasync = 0;
__pthread_unwind_next(&cb);
}
static void cancel_handler(int sig, siginfo_t *si, void *ctx)
{
struct pthread *self = __pthread_self();
__pthread_unwind_next(&cb);
}
static void cancel_handler(int sig, siginfo_t *si, void *ctx)
{
struct pthread *self = __pthread_self();
- if (
si->si_code > 0 || si->si_pid != self->pid) return;
- self->cancel = 1;
- if (self->canceldisable || (!self->cancelasync && !self->cancelpoint))
+ if (
!self->cancel) {
+ if (si->si_code == SI_TIMER && libc.sigtimer)
+ libc.sigtimer(sig, si, ctx);
return;
return;
- docancel(self);
+ }
+ if (self->canceldisable) return;
+ if (self->cancelasync || (self->cancelpoint==1 && PC_AT_SYS(ctx)))
+ docancel(self);
}
static void cancelpt(int x)
{
struct pthread *self = __pthread_self();
if (self->canceldisable) return;
}
static void cancelpt(int x)
{
struct pthread *self = __pthread_self();
if (self->canceldisable) return;
- self->cancelpoint = x;
-
if (self->cancel)
docancel(self);
+ if ((self->cancelpoint+=x)==1 && x>=0 && self->cancel)
+
docancel(self);
}
/* "rsyscall" is a mechanism by which a thread can synchronously force all
}
/* "rsyscall" is a mechanism by which a thread can synchronously force all
@@
-165,6
+175,12
@@
static void init_threads()
static int start(void *p)
{
struct pthread *self = p;
static int start(void *p)
{
struct pthread *self = p;
+ if (self->unblock_cancel) {
+ sigset_t set;
+ sigemptyset(&set);
+ sigaddset(&set, SIGCANCEL);
+ __libc_sigprocmask(SIG_UNBLOCK, &set, 0);
+ }
pthread_exit(self->start(self->start_arg));
return 0;
}
pthread_exit(self->start(self->start_arg));
return 0;
}
@@
-209,6
+225,7
@@
int pthread_create(pthread_t *res, const pthread_attr_t *attr, void *(*entry)(vo
new->tsd = (void *)tsd;
new->detached = attr->_a_detach;
new->attr = *attr;
new->tsd = (void *)tsd;
new->detached = attr->_a_detach;
new->attr = *attr;
+ new->unblock_cancel = self->cancel;
memcpy(new->tlsdesc, self->tlsdesc, sizeof new->tlsdesc);
new->tlsdesc[1] = (uintptr_t)new;
stack = (void *)((uintptr_t)new-1 & ~(uintptr_t)15);
memcpy(new->tlsdesc, self->tlsdesc, sizeof new->tlsdesc);
new->tlsdesc[1] = (uintptr_t)new;
stack = (void *)((uintptr_t)new-1 & ~(uintptr_t)15);