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authorSiddhesh Poyarekar <siddhesh@redhat.com>2012-05-15 09:41:27 +0530
committerSiddhesh Poyarekar <siddhesh@redhat.com>2012-05-15 09:41:57 +0530
commit439bf404b8fa125cf950dc1aa37838702c5353ea (patch)
treeda5913033bcfa18987da0aabf69ad99b751772a3 /nptl/sysdeps/unix
parent2949684c162a4413e42249d6b2ad554cb468b5be (diff)
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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.
Diffstat (limited to 'nptl/sysdeps/unix')
-rw-r--r--nptl/sysdeps/unix/sysv/linux/libc_multiple_threads.c3
1 files changed, 3 insertions, 0 deletions
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