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Add SF patch #468347 -- mask signals for non-main pthreads, by Jason Lowe: 

This patch updates Python/thread_pthread.h to mask all
   signals for any thread created. This will keep all
   signals masked for any thread that isn't the initial
   thread. For Solaris and Linux, the two platforms I was
   able to test it on, it solves bug #465673 (pthreads
   need signal protection) and probably will solve bug
   #219772 (Interactive InterPreter+ Thread -> core dump
   at exit).

   I'd be great if this could get some testing on other
   platforms, especially HP-UX pre 11.00 and post 11.00,
   as I had to make some guesses for the DCE thread case.
   AIX is also a concern as I saw some mention of using
   sigthreadmask() as a pthread_sigmask() equivalent, but
   this patch doesn't use sigthreadmask(). I don't have
   access to AIX.
This commit is contained in:
Guido van Rossum 2001-10-12 21:49:17 +00:00
parent 3a40f32aa6
commit 80230998b9
1 changed files with 26 additions and 0 deletions
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26
Python/thread_pthread.h
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@ -4,6 +4,7 @@
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <signal.h>
/* try to determine what version of the Pthread Standard is installed.
@ -69,6 +70,18 @@
#endif
/* On platforms that don't use standard POSIX threads pthread_sigmask()
* isn't present. DEC threads uses sigprocmask() instead as do most
* other UNIX International compliant systems that don't have the full
* pthread implementation.
*/
#ifdef PY_PTHREAD_STD
# define SET_THREAD_SIGMASK pthread_sigmask
#else
# define SET_THREAD_SIGMASK sigprocmask
#endif
/* A pthread mutex isn't sufficient to model the Python lock type
* because, according to Draft 5 of the docs (P1003.4a/D5), both of the
* following are undefined:
@ -135,6 +148,7 @@ PyThread_start_new_thread(void (*func)(void *), void *arg)
{
pthread_t th;
int success;
sigset_t oldmask, newmask;
#if defined(THREAD_STACK_SIZE) || defined(PTHREAD_SYSTEM_SCHED_SUPPORTED)
pthread_attr_t attrs;
#endif
@ -151,6 +165,14 @@ PyThread_start_new_thread(void (*func)(void *), void *arg)
#ifdef PTHREAD_SYSTEM_SCHED_SUPPORTED
pthread_attr_setscope(&attrs, PTHREAD_SCOPE_SYSTEM);
#endif
/* Mask all signals in the current thread before creating the new
* thread. This causes the new thread to start with all signals
* blocked.
*/
sigfillset(&newmask);
SET_THREAD_SIGMASK(SIG_BLOCK, &newmask, &oldmask);
success = pthread_create(&th,
#if defined(PY_PTHREAD_D4)
pthread_attr_default,
@ -174,6 +196,10 @@ PyThread_start_new_thread(void (*func)(void *), void *arg)
(void *)arg
#endif
);
/* Restore signal mask for original thread */
SET_THREAD_SIGMASK(SIG_SETMASK, &oldmask, NULL);
#ifdef THREAD_STACK_SIZE
pthread_attr_destroy(&attrs);
#endif