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_thr_sig_check_pending is also called by scope system thread when it leaves

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critical region, we wrap some syscalls for thread cancellation point, and
when syscalls returns, we call _thr_leave_cancellation_point, at the time
if a signal comes in, it would be buffered, and when the thread leaves
_thr_leave_cancellation_point, buffered signals will be processed, to avoid
messing up normal syscall errno, we should save and restore errno around
signal handling code.
This commit is contained in:
David Xu 2003-08-20 13:43:35 +00:00
parent c8c57208ce
commit 2d81cd746b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=119177
2 changed files with 6 additions and 0 deletions
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3
lib/libkse/thread/thr_sig.c
View file

@ -750,10 +750,12 @@ _thr_sig_check_pending(struct pthread *curthread)
{
ucontext_t uc;
volatile int once;
int errsave;
if (THR_IN_CRITICAL(curthread))
return;
errsave = errno;
once = 0;
THR_GETCONTEXT(&uc);
if (once == 0) {
@ -761,6 +763,7 @@ _thr_sig_check_pending(struct pthread *curthread)
curthread->check_pending = 0;
_thr_sig_rundown(curthread, &uc, NULL);
}
errno = errsave;
}
#ifndef SYSTEM_SCOPE_ONLY

3
lib/libpthread/thread/thr_sig.c
View file

@ -750,10 +750,12 @@ _thr_sig_check_pending(struct pthread *curthread)
{
ucontext_t uc;
volatile int once;
int errsave;
if (THR_IN_CRITICAL(curthread))
return;
errsave = errno;
once = 0;
THR_GETCONTEXT(&uc);
if (once == 0) {
@ -761,6 +763,7 @@ _thr_sig_check_pending(struct pthread *curthread)
curthread->check_pending = 0;
_thr_sig_rundown(curthread, &uc, NULL);
}
errno = errsave;
}
#ifndef SYSTEM_SCOPE_ONLY