Implement read write locks. This commit will support POSIX pthread

rw locks on Unix platforms.  This is based on earlier patches that I
posted to apr-dev, but did not receive feedback from others on.
Hence, I'm committing.

This will require a buildconf run for those of you who use Unix.
This has only really been tested on Solaris, but it should work
for those platforms that have POSIX rw locks.  Other Unix
platforms will simply return APR_ENOTIMPL.

Add apr_lock_acquire_rw().  Notice that the Unix implementation
will only allow a readwrite lock to be acquired via this function.
Technically, apr_lock_acquire could obtain some sort of readwrite
lock in this case, but that might lead to confusion.

Added test/testlock.c which will attempt to test *both* APR_MUTEX
and APR_READWRITE.  This was based off of the testthread.c, but has
been rewritten to use the new stdin/stdout/stderr code and just
make more sense overall.  testthread.c should probably be rewritten
to test threading more specifically.

Added framework that will hopefully still let BeOS, OS/2, and Win32
compile.  Any operation relating to an APR_READWRITE lock on these
platforms should just return APR_ENOTIMPL until the appropriate
people get around to it.  Some structure has been added to make what
they have to implement fairly obvious.  Again, I hope it compiles,
but I can't guarantee it.

Christian Gross has a Win32 readwrite lock patch floating around,
but I can't vouch for Win32 code.  The other platforms probably
have ways to do it, but I'm not sure what they are.

(Sorry, I write long commit messages...)


git-svn-id: http://svn.apache.org/repos/asf/apr/apr/trunk@61682 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 1 insertions, 1 deletions

diff --git a/configure.in b/configure.in
index 4ee64a151..3b978178e 100644
--- a/configure.in
+++ b/configure.in
@@ -280,7 +280,7 @@ else
     if test "$pthreadh" = "1"; then
         APR_CHECK_PTHREAD_GETSPECIFIC_TWO_ARGS
         APR_CHECK_PTHREAD_ATTR_GETDETACHSTATE_ONE_ARG
-        AC_CHECK_FUNCS(pthread_key_delete)
+        AC_CHECK_FUNCS(pthread_key_delete pthread_rwlock_init)
     fi
 fi