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Make _thread_suspend work with both the old broken sigtimedwait

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implementation and the new improved one.  We now precompute the
signal set passed to sigtimedwait, using an inverted set when
necessary for compatibility with older kernels.
This commit is contained in:
John Polstra 2003-06-29 15:55:44 +00:00
parent 602c788942
commit 7c916264aa
3 changed files with 31 additions and 11 deletions
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26
lib/libthr/thread/thr_init.c
View File

@ -66,6 +66,14 @@
#include "thr_private.h"
/*
* Early implementations of sigtimedwait interpreted the signal
* set incorrectly.
*/
#define SIGTIMEDWAIT_SET_IS_INVERTED(osreldate) \
((500100 <= (osreldate) && (osreldate) <= 500113) || \
(osreldate) == 501000 || (osreldate) == 501100)
extern void _thread_init_hack(void);
/*
@ -168,6 +176,7 @@ _thread_init(void)
size_t len;
int mib[2];
sigset_t set;
int osreldate;
int error;
struct clockinfo clockinfo;
@ -324,6 +333,23 @@ _thread_init(void)
SIGADDSET(set, SIGTHR);
__sys_sigprocmask(SIG_BLOCK, &set, 0);
/*
* Precompute the signal set used by _thread_suspend to wait
* for SIGTHR.
*/
mib[0] = CTL_KERN;
mib[1] = KERN_OSRELDATE;
len = sizeof(osreldate);
if (sysctl(mib, 2, &osreldate, &len, NULL, 0) == 0 &&
SIGTIMEDWAIT_SET_IS_INVERTED(osreldate)) {
/* Kernel bug requires an inverted signal set. */
SIGFILLSET(_thread_suspend_sigset);
SIGDELSET(_thread_suspend_sigset, SIGTHR);
} else {
SIGEMPTYSET(_thread_suspend_sigset);
SIGADDSET(_thread_suspend_sigset, SIGTHR);
}
/* Get the kernel clockrate: */
mib[0] = CTL_KERN;
mib[1] = KERN_CLOCKRATE;

13
lib/libthr/thread/thr_kern.c
View File

@ -179,15 +179,8 @@ _thread_suspend(pthread_t pthread, struct timespec *abstime)
struct timespec remaining;
struct timespec *ts;
siginfo_t info;
sigset_t set;
int error;
/*
* Catch SIGTHR.
*/
SIGFILLSET(set);
SIGDELSET(set, SIGTHR);
/*
* Compute the remainder of the run time.
*/
@ -204,9 +197,7 @@ _thread_suspend(pthread_t pthread, struct timespec *abstime)
} else
ts = NULL;
error = sigtimedwait(&set, &info, ts);
if (error == -1)
error = errno;
error = sigtimedwait(&_thread_suspend_sigset, &info, ts);
error = (error == -1) ? errno : 0;
return (error);
}

3
lib/libthr/thread/thr_private.h
View File

@ -692,6 +692,9 @@ SCLASS pthread_cond_t _gc_cond
*/
SCLASS struct sigaction _thread_sigact[NSIG];
/* Precomputed signal set for _thread_suspend. */
SCLASS sigset_t _thread_suspend_sigset;
/* Tracks the number of threads blocked while waiting for a spinlock. */
SCLASS volatile int _spinblock_count
#ifdef GLOBAL_PTHREAD_PRIVATE