posix: rwlock: make pthread_rwlock_t a pooled ipc type

Like mutex, barrier, cond, spinlock, etc, make
pthread_rwlock_t a pooled ipc type.

Signed-off-by: Christopher Friedt <[email protected]>

Author: Christopher Friedt

include/zephyr/posix/posix_types.h

@@ -90,13 +90,7 @@ typedef struct pthread_barrierattr {
 
 typedef uint32_t pthread_rwlockattr_t;
 
-typedef struct pthread_rwlock_obj {
-	struct k_sem rd_sem;
-	struct k_sem wr_sem;
-	struct k_sem reader_active;/* blocks WR till reader has acquired lock */
-	int32_t status;
-	k_tid_t wr_owner;
-} pthread_rwlock_t;
+typedef uint32_t pthread_rwlock_t;
 
 struct pthread_once {
 	bool flag;

include/zephyr/posix/pthread.h

@@ -136,6 +136,13 @@ int pthread_condattr_setclock(pthread_condattr_t *att, clockid_t clock_id);
  */
 #define PTHREAD_MUTEX_INITIALIZER (-1)
 
+/**
+ * @brief Declare a rwlock as initialized
+ *
+ * Initialize a rwlock with the default rwlock attributes.
+ */
+#define PTHREAD_RWLOCK_INITIALIZER (-1)
+
 /*
  *  Mutex attributes - type
  *

lib/posix/CMakeLists.txt

@@ -54,7 +54,7 @@ zephyr_library_sources_ifdef(CONFIG_PTHREAD_COND cond.c)
 zephyr_library_sources_ifdef(CONFIG_PTHREAD_KEY key.c)
 zephyr_library_sources_ifdef(CONFIG_PTHREAD_MUTEX mutex.c)
 zephyr_library_sources_ifdef(CONFIG_PTHREAD pthread.c)
-zephyr_library_sources_ifdef(CONFIG_PTHREAD_IPC rwlock.c)
+zephyr_library_sources_ifdef(CONFIG_PTHREAD_RWLOCK rwlock.c)
 zephyr_library_sources_ifdef(CONFIG_POSIX_PRIORITY_SCHEDULING sched.c)
 zephyr_library_sources_ifdef(CONFIG_PTHREAD_IPC semaphore.c)
 zephyr_library_sources_ifdef(CONFIG_PTHREAD_SPINLOCK spinlock.c)

lib/posix/Kconfig

@@ -49,6 +49,7 @@ source "lib/posix/Kconfig.limits"
 source "lib/posix/Kconfig.mqueue"
 source "lib/posix/Kconfig.mutex"
 source "lib/posix/Kconfig.pthread"
+source "lib/posix/Kconfig.rwlock"
 source "lib/posix/Kconfig.sched"
 source "lib/posix/Kconfig.semaphore"
 source "lib/posix/Kconfig.signal"

lib/posix/Kconfig.rwlock

@@ -0,0 +1,8 @@
+# Copyright (c) 2024 Meta
+#
+# SPDX-License-Identifier: Apache-2.0
+
+TYPE = PTHREAD_RWLOCK
+type = pthread_rwlock_t
+type-function = pthread_rwlock_timedrdlock
+source "lib/posix/Kconfig.template.pooled_ipc_type"