From 439bf404b8fa125cf950dc1aa37838702c5353ea Mon Sep 17 00:00:00 2001 From: Siddhesh Poyarekar Date: Tue, 15 May 2012 09:41:27 +0530 Subject: Allow a single-threaded program to cancel itself There is nothing in the POSIX specification to disallow a single-threaded program from cancelling itself, so we forcibly enable multiple_threads to allow the next available cancellation point in the thread to run. Also added additional tests to cover various cancellation scenarios. --- nptl/sysdeps/unix/sysv/linux/libc_multiple_threads.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'nptl/sysdeps/unix/sysv') diff --git a/nptl/sysdeps/unix/sysv/linux/libc_multiple_threads.c b/nptl/sysdeps/unix/sysv/linux/libc_multiple_threads.c index 7fffb0d808..459b8cf7c0 100644 --- a/nptl/sysdeps/unix/sysv/linux/libc_multiple_threads.c +++ b/nptl/sysdeps/unix/sysv/linux/libc_multiple_threads.c @@ -20,6 +20,9 @@ #ifndef NOT_IN_libc # ifndef TLS_MULTIPLE_THREADS_IN_TCB +/* Variable set to a nonzero value either if more than one thread runs or ran, + or if a single-threaded process is trying to cancel itself. See + nptl/descr.h for more context on the single-threaded process case. */ int __libc_multiple_threads attribute_hidden; # endif #endif -- cgit 1.4.1