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dnl Christian Schoenebeck 2007-10-18 |
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dnl -------------------------------------------------------------------------- |
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dnl |
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dnl Synopsis: |
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dnl |
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dnl ACX_NPTL_GLIBC_BUG([ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]) |
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dnl |
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dnl Check for NPTL glibc bug which caused crashs on Gentoo systems, see |
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dnl Gentoo bug report #194076 for details. This test is ignored on cross- |
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dnl compilations. On Windows systems this test always succeeds. |
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dnl |
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dnl Note: this test requires LIBS, CFLAGS and CC already been set, i.e. by |
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dnl using ACX_PTHREAD before calling this macro. |
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dnl |
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dnl -------------------------------------------------------------------------- |
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AC_DEFUN([ACX_NPTL_GLIBC_BUG], |
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[ |
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|
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AC_MSG_CHECKING(for NPTL bug) |
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|
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AC_LANG_SAVE |
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AC_LANG_C |
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|
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AC_TRY_RUN([ |
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|
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#include <stdlib.h> |
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|
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#if WIN32 |
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|
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int main() { |
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exit(0); |
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} |
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|
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#else /* POSIX system */ |
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|
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#include <stdio.h> |
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#include <pthread.h> |
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#include <unistd.h> |
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|
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pthread_attr_t __thread_attr; |
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pthread_t __thread_id; |
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|
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pthread_mutex_t __posix_mutex; |
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pthread_mutexattr_t __posix_mutexattr; |
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|
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/// entry point for the spawned thread |
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void* __pthread_launcher(void* p) { |
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// let the thread be killable under any circumstances |
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// (without this function call, this test always succeeds !) |
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pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL); |
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|
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// this will block this 2nd thread, since we already |
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// locked this mutex by the main thread |
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pthread_mutex_lock(&__posix_mutex); |
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|
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// here we would access shared resources, etc. |
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|
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// just pro forma, the remainder of this function is actually not of |
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// interest, since this thread is always terminated at its mutex lock call |
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pthread_mutex_unlock(&__posix_mutex); |
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return NULL; |
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} |
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|
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int main() { |
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|
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// initialize mutex and thread attribute |
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pthread_mutexattr_init(&__posix_mutexattr); |
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pthread_mutex_init(&__posix_mutex, &__posix_mutexattr); |
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pthread_attr_init(&__thread_attr); |
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|
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// already lock the mutex by the main thread ... |
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pthread_mutex_lock(&__posix_mutex); |
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|
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int res; |
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|
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// create and run a 2nd thread |
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res = pthread_create(&__thread_id, &__thread_attr, __pthread_launcher, NULL); |
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if (res) { |
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exit(-1); |
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} |
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|
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// give the other thread a chance to spawn |
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usleep(400000); |
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|
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// kill the other thread |
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pthread_cancel(__thread_id); |
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pthread_detach(__thread_id); |
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|
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// give the other thread a chance to finish its execution |
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usleep(400000); |
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|
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// cleanup |
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// (just pro forma, doesnt actually matter for this test case) |
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pthread_attr_destroy(&__thread_attr); |
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pthread_mutex_destroy(&__posix_mutex); |
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pthread_mutexattr_destroy(&__posix_mutexattr); |
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|
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exit(0); |
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} |
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#endif /* WIN32 */ |
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|
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],[ |
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AC_MSG_RESULT(no) |
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ifelse([$2], , :, [$2]) |
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], [ |
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AC_MSG_RESULT(yes) |
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ifelse([$1], , :, [$1]) |
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], [ |
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AC_MSG_RESULT(disabled) |
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ifelse([$2], , :, [$2]) |
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]) |
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|
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AC_LANG_RESTORE |
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]) |