From 685b55093c390c42f0371340e0c057c475c1af39 Mon Sep 17 00:00:00 2001 From: jasone Date: Tue, 27 Jun 2000 21:30:16 +0000 Subject: If multiple threads are blocked in sigwait() for the same signal that does not have a user-supplied signal handler, when a signal is delivered, one thread will receive the signal, and then the code reverts to having no signal handler for the signal. This can leave the other sigwait()ing threads stranded permanently if the signal is later ignored, or can result in process termination when the process should have delivered the signal to one of the threads in sigwait(). To fix this problem, maintain a count of sigwait()ers for each signal that has no default signal handler. Use the count to correctly install/uninstall dummy signal handlers. Reviewed by: deischen --- lib/libpthread/thread/thr_init.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'lib/libpthread/thread/thr_init.c') diff --git a/lib/libpthread/thread/thr_init.c b/lib/libpthread/thread/thr_init.c index dd5f53f..8e13f90 100644 --- a/lib/libpthread/thread/thr_init.c +++ b/lib/libpthread/thread/thr_init.c @@ -277,6 +277,9 @@ _thread_init(void) */ PANIC("Cannot read signal handler info"); } + + /* Initialize the SIG_DFL dummy handler count. */ + _thread_dfl_count[i] = 0; } /* -- cgit v1.1