Backport support for read/write locks.

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@49022 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configure

@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.ac Revision: 48561 .
+# From configure.ac Revision: 48960 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.61.
 #
@@ -14065,6 +14065,114 @@ fi
 done
 
 
+{ echo "$as_me:$LINENO: checking for PTHREAD_RWLOCK_INITIALIZER" >&5
+echo $ECHO_N "checking for PTHREAD_RWLOCK_INITIALIZER... $ECHO_C" >&6; }
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <pthread.h>
+int
+main ()
+{
+int foo = PTHREAD_RWLOCK_INITIALIZER;
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_link") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest$ac_exeext &&
+       $as_test_x conftest$ac_exeext; then
+  { echo "$as_me:$LINENO: result: yes" >&5
+echo "${ECHO_T}yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_PTHREAD_RWLOCK_INITIALIZER 1
+_ACEOF
+
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	{ echo "$as_me:$LINENO: result: no" >&5
+echo "${ECHO_T}no" >&6; }
+
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
+      conftest$ac_exeext conftest.$ac_ext
+
+{ echo "$as_me:$LINENO: checking for PTHREAD_RWLOCK_PREFER_WRITER_NP" >&5
+echo $ECHO_N "checking for PTHREAD_RWLOCK_PREFER_WRITER_NP... $ECHO_C" >&6; }
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <pthread.h>
+int
+main ()
+{
+int foo = PTHREAD_RWLOCK_PREFER_WRITER_NP;
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_link") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest$ac_exeext &&
+       $as_test_x conftest$ac_exeext; then
+  { echo "$as_me:$LINENO: result: yes" >&5
+echo "${ECHO_T}yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_PTHREAD_RWLOCK_PREFER_WRITER_NP 1
+_ACEOF
+
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	{ echo "$as_me:$LINENO: result: no" >&5
+echo "${ECHO_T}no" >&6; }
+
+fi
+
+rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
+      conftest$ac_exeext conftest.$ac_ext
+
 { echo "$as_me:$LINENO: checking for compiler atomic operations" >&5
 echo $ECHO_N "checking for compiler atomic operations... $ECHO_C" >&6; }
 cat >conftest.$ac_ext <<_ACEOF

configure.ac

@@ -261,6 +261,24 @@ AC_FUNC_UTIME_NULL
 AC_FUNC_VPRINTF
 AC_CHECK_FUNCS([asprintf atexit bzero dup2 endpwent floor ftruncate getcwd gethostbyname gethostname getloadavg gettimeofday inet_ntoa isascii localtime_r memchr memmove memset mkdir munmap pow putenv re_comp regcomp rint select setenv socket sqrt strcasecmp strcasestr strchr strcspn strdup strerror strncasecmp strndup strnlen strrchr strsep strspn strstr strtol strtoq unsetenv utime vasprintf])
 
+AC_MSG_CHECKING(for PTHREAD_RWLOCK_INITIALIZER)
+AC_LINK_IFELSE(
+        AC_LANG_PROGRAM([#include <pthread.h>],
+                        [int foo = PTHREAD_RWLOCK_INITIALIZER;]),
+        AC_MSG_RESULT(yes)
+        AC_DEFINE([HAVE_PTHREAD_RWLOCK_INITIALIZER], 1, [Define to 1 if your system has PTHREAD_RWLOCK_INITIALIZER.]),
+        AC_MSG_RESULT(no)
+)
+
+AC_MSG_CHECKING(for PTHREAD_RWLOCK_PREFER_WRITER_NP)
+AC_LINK_IFELSE(
+        AC_LANG_PROGRAM([#include <pthread.h>],
+                        [int foo = PTHREAD_RWLOCK_PREFER_WRITER_NP;]),
+        AC_MSG_RESULT(yes)
+        AC_DEFINE([HAVE_PTHREAD_RWLOCK_PREFER_WRITER_NP], 1, [Define to 1 if your system has PTHREAD_RWLOCK_PREFER_WRITER_NP.]),
+        AC_MSG_RESULT(no)
+)
+
 AC_MSG_CHECKING(for compiler atomic operations)
 AC_LINK_IFELSE(
 AC_LANG_PROGRAM([], [int foo1; int foo2 = __sync_fetch_and_add(&foo1, 1);]),

include/asterisk/autoconfig.h.in

@@ -250,6 +250,12 @@
 /* Define to indicate the ${PRI_DESCRIP} library */
 #undef HAVE_PRI
 
+/* Define to 1 if your system has PTHREAD_RWLOCK_INITIALIZER. */
+#undef HAVE_PTHREAD_RWLOCK_INITIALIZER
+
+/* Define to 1 if your system has PTHREAD_RWLOCK_PREFER_WRITER_NP. */
+#undef HAVE_PTHREAD_RWLOCK_PREFER_WRITER_NP
+
 /* Define to 1 if the system has the type `ptrdiff_t'. */
 #undef HAVE_PTRDIFF_T
 

include/asterisk/lock.h

@@ -614,6 +614,72 @@ static void  __attribute__ ((destructor)) fini_##mutex(void) \
 #define pthread_create __use_ast_pthread_create_instead__
 #endif
 
+typedef pthread_rwlock_t ast_rwlock_t;
+
+static inline int ast_rwlock_init(ast_rwlock_t *prwlock)
+{
+	pthread_rwlockattr_t attr;
+
+	pthread_rwlockattr_init(&attr);
+	
+#ifdef HAVE_PTHREAD_RWLOCK_PREFER_WRITER_NP
+	pthread_rwlockattr_setkind_np(&attr, PTHREAD_RWLOCK_PREFER_WRITER_NP);
+#endif
+	
+	return pthread_rwlock_init(prwlock, &attr);
+}
+
+static inline int ast_rwlock_destroy(ast_rwlock_t *prwlock)
+{
+	return pthread_rwlock_destroy(prwlock);
+}
+
+static inline int ast_rwlock_unlock(ast_rwlock_t *prwlock)
+{
+	return pthread_rwlock_unlock(prwlock);
+}
+
+static inline int ast_rwlock_rdlock(ast_rwlock_t *prwlock)
+{
+	return pthread_rwlock_rdlock(prwlock);
+}
+
+static inline int ast_rwlock_tryrdlock(ast_rwlock_t *prwlock)
+{
+	return pthread_rwlock_tryrdlock(prwlock);
+}
+
+static inline int ast_rwlock_wrlock(ast_rwlock_t *prwlock)
+{
+	return pthread_rwlock_wrlock(prwlock);
+}
+
+static inline int ast_rwlock_trywrlock(ast_rwlock_t *prwlock)
+{
+	return pthread_rwlock_trywrlock(prwlock);
+}
+
+/* Statically declared read/write locks */
+
+#ifndef HAVE_PTHREAD_RWLOCK_INITIALIZER
+#define __AST_RWLOCK_DEFINE(scope, rwlock) \
+        scope ast_rwlock_t rwlock; \
+static void  __attribute__ ((constructor)) init_##rwlock(void) \
+{ \
+        ast_rwlock_init(&rwlock); \
+} \
+static void  __attribute__ ((destructor)) fini_##rwlock(void) \
+{ \
+        ast_rwlock_destroy(&rwlock); \
+}
+#else
+#define AST_RWLOCK_INIT_VALUE PTHREAD_RWLOCK_INITIALIZER
+#define __AST_RWLOCK_DEFINE(scope, rwlock) \
+        scope ast_rwlock_t rwlock = AST_RWLOCK_INIT_VALUE
+#endif
+
+#define AST_RWLOCK_DEFINE_STATIC(rwlock) __AST_RWLOCK_DEFINE(static, rwlock)
+
 /*
  * Initial support for atomic instructions.
  * For platforms that have it, use the native cpu instruction to