locks: introduce apr_{thread,proc,global}_mutex_timedlock().

For proc mutexes, the new mechanism APR_LOCK_DEFAULT_TIMED usable at creation time
allows for the best mechanism to be elected (unixes: 1 to 3, or specific: 4 to 7):
1. PROC_PTHREAD if pthread_mutex_timedlock() and pthread_mutex_set_robust_np()
   are both available,
2. SYSV if semtimedop() is availale,
3. POSIXSEM if sem_timedwait() is available,
4. BeOS' acquire_sem_etc() if available,
5. NetWare falls back to apr_thread_mutex_timedlock() as for others functions,
6. OS2's DosRequestMutexSem(),
7. Windows' WaitForSingleObject().
Otherwise (like when fcntl and flock only are availble, if that's ever possible),
APR_ENOTIMPL is returned.

For thread mutexes, the new flag APR_THREAD_MUTEX_TIMED, usable at create()
time still, allows to switch to an implementation using a condition variable
and apr_thread_cond_timedwait() when if no native mechanism is available (eg.
NetWare, pthreads but without pthread_mutex_timedlock() available).
On windows, this initializes a WaitForSingleObject()able handle (Mutex) instead
of the fastest (but not timeout-able) CRITICAL_SECTION used by default.

All apr_{thread,proc,global}_mutex_timedlock() functions can take a relative or
absolute time, thanks to the last (boolean) argument.

Test suite updated accordingly.


git-svn-id: http://svn.apache.org/repos/asf/apr/apr/trunk@1667900 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 18 insertions, 8 deletions

diff --git a/configure.in b/configure.in
index d6831aa04..fefb88970 100644
--- a/configure.in
+++ b/configure.in
@@ -2057,10 +2057,17 @@ dnl ----------------------------- Checking for Locking Characteristics
 AC_MSG_NOTICE([])
 AC_MSG_NOTICE([Checking for Locking...])
 
-AC_CHECK_FUNCS(semget semctl flock)
-AC_CHECK_HEADERS(semaphore.h OS.h)
+AC_CHECK_FUNCS(semget semctl semop semtimedop flock)
+APR_IFALLYES(func:semtimedop, have_semtimedop="1", have_semtimedop="0")
+
+AC_CHECK_HEADERS(semaphore.h)
 AC_SEARCH_LIBS(sem_open, rt)
-AC_CHECK_FUNCS(sem_close sem_unlink sem_post sem_wait create_sem)
+AC_CHECK_FUNCS(sem_close sem_unlink sem_post sem_wait sem_timedwait)
+APR_IFALLYES(func:sem_timedwait, have_sem_timedwait="1", have_sem_timedwait="0")
+
+AC_CHECK_HEADERS(OS.h)
+AC_CHECK_FUNCS(create_sem acquire_sem acquire_sem_etc)
+APR_IFALLYES(header:OS.h func:acquire_sem_etc, have_acquire_sem_etc="1", have_acquire_sem_etc="0")
 
 # Some systems return ENOSYS from sem_open.
 AC_CACHE_CHECK(for working sem_open,ac_cv_func_sem_open,[
@@ -2119,7 +2126,10 @@ APR_CHECK_DEFINE_FILES(POLLIN, poll.h sys/poll.h)
 
 if test "$threads" = "1"; then
     APR_CHECK_DEFINE(PTHREAD_PROCESS_SHARED, pthread.h)
-    AC_CHECK_FUNCS(pthread_mutexattr_setpshared)
+    AC_CHECK_FUNCS(pthread_mutex_timedlock pthread_mutexattr_setpshared)
+    APR_IFALLYES(header:pthread.h func:pthread_mutex_timedlock,
+                 have_pthread_mutex_timedlock="1", have_pthread_mutex_timedlock="0")
+    AC_SUBST(have_pthread_mutex_timedlock)
     # Some systems have setpshared and define PROCESS_SHARED, but don't 
     # really support PROCESS_SHARED locks.  So, we must validate that we 
     # can go through the steps without receiving some sort of system error.
@@ -2157,8 +2167,8 @@ fi
 APR_IFALLYES(header:semaphore.h func:sem_open func:sem_close dnl
              func:sem_unlink func:sem_post func:sem_wait,
              hasposixser="1", hasposixser="0")
-APR_IFALLYES(func:semget func:semctl define:SEM_UNDO, hassysvser="1", 
-             hassysvser="0")
+APR_IFALLYES(func:semget func:semctl func:semop define:SEM_UNDO,
+             hassysvser="1", hassysvser="0")
 APR_IFALLYES(func:flock define:LOCK_EX, hasflockser="1", hasflockser="0")
 APR_IFALLYES(header:fcntl.h define:F_SETLK, hasfcntlser="1", hasfcntlser="0")
 # note: the current APR use of shared mutex requires /dev/zero
@@ -2183,9 +2193,9 @@ APR_IFALLYES(func:flock define:LOCK_EX,
             APR_DECIDE(USE_FLOCK_SERIALIZE, [4.2BSD-style flock()]))
 APR_IFALLYES(header:fcntl.h define:F_SETLK,
             APR_DECIDE(USE_FCNTL_SERIALIZE, [SVR4-style fcntl()]))
-APR_IFALLYES(func:semget func:semctl define:SEM_UNDO,
+APR_IFALLYES(func:semget func:semctl func:semop define:SEM_UNDO,
             APR_DECIDE(USE_SYSVSEM_SERIALIZE, [SysV IPC semget()]))
-APR_IFALLYES(header:OS.h func:create_sem, 
+APR_IFALLYES(header:OS.h func:create_sem func:acquire_sem func:acquire_sem_etc, 
             APR_DECIDE(USE_BEOSSEM, [BeOS Semaphores])) 
 if test "x$apr_lock_method" != "x"; then
     APR_DECISION_FORCE($apr_lock_method)