Support pthread with no recursive mutex (SunOS 5.6)
- From
- Gary V. Vaughan <git@mlists.thewrittenword.com>
- Date
- Nov 2, 2010, 14:12 UTC
- Message-ID
- <20101102141227.GA3991@thor.il.thewrittenword.com>
Thanks for merging my last patch series into the new release. git 1.7.3.2 now compiles correctly on all of our hosts, save Solaris 2.6 (SunOS 5.6) which has no recursive mutex support in its pthreads. While we could penalize that platform by disabling threads entirely, they worked perfectly well up until this release.
This patch adds a new configure and Makefile setting to selectively disable just the single recursive mutex usage in favour of the older implementation that used a simple non-recursive mutex in the same spot, but on just Solaris 2.6.
Signed-off-by: Gary V. Vaughan <gary@thewrittenword.com> --- Makefile | 4 ++++ builtin/pack-objects.c | 4 ++++ config.mak.in | 1 + configure.ac | 16 ++++++++++++++++ thread-utils.c | 2 ++ thread-utils.h | 2 ++ 6 files changed, 29 insertions(+)
Index: b/Makefile =================================================================== --- a/Makefile +++ b/Makefile @@ -119,6 +119,9 @@ all:: # # Define NO_PTHREADS if you do not have or do not want to use Pthreads. # +# Define NO_RECURSIVE_MUTEX if you do have Pthreads, but with no support for +# recursive mutexs (SunOS 5.6). +# # Define NO_PREAD if you have a problem with pread() system call (e.g. # cygwin1.dll before v1.5.22). # @@ -847,6 +850,7 @@ ifeq ($(uname_S),SunOS) SOCKLEN_T = int NO_HSTRERROR = YesPlease NO_IPV6 = YesPlease + NO_RECURSIVE_MUTEX = YesPlease NO_SOCKADDR_STORAGE = YesPlease NO_UNSETENV = YesPlease NO_SETENV = YesPlease Index: b/builtin/pack-objects.c =================================================================== --- a/builtin/pack-objects.c +++ b/builtin/pack-objects.c @@ -1561,7 +1561,11 @@ static pthread_cond_t progress_cond; */ static void init_threaded_search(void) { +#ifndef NO_RECURSIVE_MUTEX init_recursive_mutex(&read_mutex); +#else + pthread_mutex_init(&read_mutex, NULL); +#endif pthread_mutex_init(&cache_mutex, NULL); pthread_mutex_init(&progress_mutex, NULL); pthread_cond_init(&progress_cond, NULL); Index: b/configure.ac =================================================================== --- a/configure.ac +++ b/configure.ac @@ -876,6 +876,9 @@ AC_SUBST(NO_MKSTEMPS) # Define NO_PTHREADS if we do not have pthreads. # # Define PTHREAD_LIBS to the linker flag used for Pthread support. +# +# Define NO_RECURSIVE_MUTEX if you do have Pthreads, but with no support for +# recursive mutexes (SunOS 5.6). AC_DEFUN([PTHREADTEST_SRC], [ #include <pthread.h> @@ -940,9 +943,22 @@ fi CFLAGS="$old_CFLAGS" +if test $threads_found = yes; then + AC_MSG_CHECKING([Checking for PTHREAD_MUTEX_RECURSIVE support]) + AC_EGREP_HEADER([PTHREAD_MUTEX_RECURSIVE], [pthread.h], + [], [NO_RECURSIVE_MUTEX=YesPlease]) + if test -n "$NO_RECURSIVE_MUTEX"; then + AC_MSG_RESULT([no]) + else + AC_MSG_RESULT([yes]) + fi +fi + + AC_SUBST(PTHREAD_CFLAGS) AC_SUBST(PTHREAD_LIBS) AC_SUBST(NO_PTHREADS) +AC_SUBST(NO_RECURSIVE_MUTEX) ## Output files AC_CONFIG_FILES(["${config_file}":"${config_in}":"${config_append}"]) Index: b/thread-utils.c =================================================================== --- a/thread-utils.c +++ b/thread-utils.c @@ -45,6 +45,7 @@ int online_cpus(void) return 1; } +#ifndef NO_RECURSIVE_MUTEX int init_recursive_mutex(pthread_mutex_t *m) { pthread_mutexattr_t a; @@ -59,3 +60,4 @@ int init_recursive_mutex(pthread_mutex_t } return ret; } +#endif Index: b/thread-utils.h =================================================================== --- a/thread-utils.h +++ b/thread-utils.h @@ -2,6 +2,8 @@ #define THREAD_COMPAT_H extern int online_cpus(void); +#ifndef NO_RECURSIVE_MUTEX extern int init_recursive_mutex(pthread_mutex_t*); +#endif #endif /* THREAD_COMPAT_H */ Index: b/config.mak.in =================================================================== --- a/config.mak.in +++ b/config.mak.in @@ -66,5 +66,6 @@ SOCKLEN_T=@SOCKLEN_T@ FREAD_READS_DIRECTORIES=@FREAD_READS_DIRECTORIES@ SNPRINTF_RETURNS_BOGUS=@SNPRINTF_RETURNS_BOGUS@ NO_PTHREADS=@NO_PTHREADS@ +NO_RECURSIVE_MUTEX=@NO_RECURSIVE_MUTEX@ PTHREAD_CFLAGS=@PTHREAD_CFLAGS@ PTHREAD_LIBS=@PTHREAD_LIBS@ -- Gary V. Vaughan (gary@thewrittenword.com)