platform: remove reader/writer locks

The only thing using this was the transport lookups, but as
those transports are now fully initialized in nng_init, we
no longer need to lock that at all.

4 files changed, 1 insertions, 103 deletions

diff --git a/src/platform/posix/posix_impl.h b/src/platform/posix/posix_impl.h
index b6435353..2229f17c 100644
--- a/src/platform/posix/posix_impl.h
+++ b/src/platform/posix/posix_impl.h
@@ -65,15 +65,6 @@ struct nni_plat_mtx {
 		PTHREAD_MUTEX_INITIALIZER \
 	}
 
-struct nni_rwlock {
-	pthread_rwlock_t rwl;
-};
-
-#define NNI_RWLOCK_INITIALIZER             \
-	{                                  \
-		PTHREAD_RWLOCK_INITIALIZER \
-	}
-
 // No static form of CV initialization because of the need to use
 // attributes to set the clock type.
 struct nni_plat_cv {
diff --git a/src/platform/posix/posix_thread.c b/src/platform/posix/posix_thread.c
index e8c9036c..ac6371c9 100644
--- a/src/platform/posix/posix_thread.c
+++ b/src/platform/posix/posix_thread.c
@@ -156,53 +156,6 @@ nni_plat_mtx_unlock(nni_plat_mtx *mtx)
 }
 
 void
-nni_rwlock_init(nni_rwlock *rwl)
-{
-	while (pthread_rwlock_init(&rwl->rwl, NULL) != 0) {
-		// We must have memory exhaustion -- ENOMEM, or
-		// in some cases EAGAIN.  Wait a bit before we try to
-		// give things a chance to settle down.
-		nni_msleep(10);
-	}
-}
-
-void
-nni_rwlock_fini(nni_rwlock *rwl)
-{
-	int rv;
-	if ((rv = pthread_rwlock_destroy(&rwl->rwl)) != 0) {
-		nni_panic("pthread_rwlock_destroy: %s", strerror(rv));
-	}
-}
-
-void
-nni_rwlock_rdlock(nni_rwlock *rwl)
-{
-	int rv;
-	if ((rv = pthread_rwlock_rdlock(&rwl->rwl)) != 0) {
-		nni_panic("pthread_rwlock_rdlock: %s", strerror(rv));
-	}
-}
-
-void
-nni_rwlock_wrlock(nni_rwlock *rwl)
-{
-	int rv;
-	if ((rv = pthread_rwlock_wrlock(&rwl->rwl)) != 0) {
-		nni_panic("pthread_rwlock_wrlock: %s", strerror(rv));
-	}
-}
-
-void
-nni_rwlock_unlock(nni_rwlock *rwl)
-{
-	int rv;
-	if ((rv = pthread_rwlock_unlock(&rwl->rwl)) != 0) {
-		nni_panic("pthread_rwlock_unlock: %s", strerror(rv));
-	}
-}
-
-void
 nni_plat_cv_init(nni_plat_cv *cv, nni_plat_mtx *mtx)
 {
 	// See the comments in nni_plat_mtx_init.  Almost everywhere this
diff --git a/src/platform/windows/win_impl.h b/src/platform/windows/win_impl.h
index 1659b099..db190d42 100644
--- a/src/platform/windows/win_impl.h
+++ b/src/platform/windows/win_impl.h
@@ -44,16 +44,6 @@ struct nni_plat_mtx {
 		SRWLOCK_INIT \
 	}
 
-struct nni_rwlock {
-	SRWLOCK rwl;
-	BOOLEAN exclusive;
-};
-
-#define NNI_RWLOCK_INITIALIZER \
-	{                      \
-		SRWLOCK_INIT   \
-	}
-
 struct nni_plat_cv {
 	CONDITION_VARIABLE cv;
 	PSRWLOCK           srl;
diff --git a/src/platform/windows/win_thread.c b/src/platform/windows/win_thread.c
index c76209c1..7d865604 100644
--- a/src/platform/windows/win_thread.c
+++ b/src/platform/windows/win_thread.c
@@ -1,5 +1,5 @@
 //
-// Copyright 2024 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2025 Staysail Systems, Inc. <info@staysail.tech>
 // Copyright 2018 Capitar IT Group BV <info@capitar.com>
 //
 // This software is supplied under the terms of the MIT License, a
@@ -79,42 +79,6 @@ nni_plat_mtx_unlock(nni_plat_mtx *mtx)
 }
 
 void
-nni_rwlock_init(nni_rwlock *rwl)
-{
-	InitializeSRWLock(&rwl->rwl);
-}
-
-void
-nni_rwlock_fini(nni_rwlock *rwl)
-{
-	rwl->exclusive = FALSE;
-}
-
-void
-nni_rwlock_rdlock(nni_rwlock *rwl)
-{
-	AcquireSRWLockShared(&rwl->rwl);
-}
-
-void
-nni_rwlock_wrlock(nni_rwlock *rwl)
-{
-	AcquireSRWLockExclusive(&rwl->rwl);
-	rwl->exclusive = TRUE;
-}
-
-void
-nni_rwlock_unlock(nni_rwlock *rwl)
-{
-	if (rwl->exclusive) {
-		rwl->exclusive = FALSE;
-		ReleaseSRWLockExclusive(&rwl->rwl);
-	} else {
-		ReleaseSRWLockShared(&rwl->rwl);
-	}
-}
-
-void
 nni_plat_cv_init(nni_plat_cv *cv, nni_plat_mtx *mtx)
 {
 	InitializeConditionVariable(&cv->cv);