diff options
Diffstat (limited to 'm4/pthread_rwlock_rdlock.m4')
| -rw-r--r-- | m4/pthread_rwlock_rdlock.m4 | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/m4/pthread_rwlock_rdlock.m4 b/m4/pthread_rwlock_rdlock.m4 index 9c1d5d0..6812b4f 100644 --- a/m4/pthread_rwlock_rdlock.m4 +++ b/m4/pthread_rwlock_rdlock.m4 @@ -1,4 +1,4 @@ -# pthread_rwlock_rdlock.m4 serial 1 +# pthread_rwlock_rdlock.m4 serial 2 dnl Copyright (C) 2017-2018 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -23,12 +23,14 @@ dnl time, a phenomenon called "writer starvation". dnl Without such a guarantee, applications have a hard time avoiding writer dnl starvation. dnl -dnl POSIX:2008 makes this requirement only for implementations that support TPS +dnl POSIX:2017 makes this requirement only for implementations that support TPS dnl (Thread Priority Scheduling) and only for the scheduling policies SCHED_FIFO dnl and SCHED_RR, see dnl http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_rwlock_rdlock.html -dnl but test verifies the guarantee regardless of TPS and regardless of +dnl but this test verifies the guarantee regardless of TPS and regardless of dnl scheduling policy. +dnl Glibc currently does not provide this guarantee, see +dnl https://sourceware.org/bugzilla/show_bug.cgi?id=13701 AC_DEFUN([gl_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER], [ AC_REQUIRE([gl_THREADLIB_EARLY]) |