Date: Wed, 27 Jun 2001 04:41:16 -0700 (PDT) From: Jason Evans <jasone@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/lib/libc_r/uthread pthread_private.h uthread_find_thread.c uthread_join.c Message-ID: <200106271141.f5RBfGm89143@freefall.freebsd.org>
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jasone 2001/06/27 04:41:16 PDT
Modified files:
lib/libc_r/uthread pthread_private.h uthread_find_thread.c
uthread_join.c
Log:
Fix a race condition in pthread_join(). All of the following must occur
atomically:
1) Search _thread_list for the thread to join.
2) Search _dead_list for the thread to join.
3) Set the running thread as the joiner.
While we're at it, fix a race in the case where multiple threads try to
join on the same thread. POSIX says that the behavior of multiple joiners
is undefined, but the fix is cheap as a result of the other fix.
Revision Changes Path
1.58 +1 -2 src/lib/libc_r/uthread/pthread_private.h
1.7 +1 -33 src/lib/libc_r/uthread/uthread_find_thread.c
1.18 +54 -16 src/lib/libc_r/uthread/uthread_join.c
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