Implement support for pthread_rwlock (#321)

* threads: implement support for pthread_rwlockattr

* threads: implement support for pthread_rwlock

Author: loganek

Makefile

@@ -211,6 +211,18 @@ LIBC_TOP_HALF_MUSL_SOURCES += \
         thread/pthread_mutexattr_setpshared.c \
         thread/pthread_mutexattr_setrobust.c \
         thread/pthread_mutexattr_settype.c \
+        thread/pthread_rwlock_destroy.c \
+        thread/pthread_rwlock_init.c \
+        thread/pthread_rwlock_rdlock.c \
+        thread/pthread_rwlock_timedrdlock.c \
+        thread/pthread_rwlock_timedwrlock.c \
+        thread/pthread_rwlock_tryrdlock.c \
+        thread/pthread_rwlock_trywrlock.c \
+        thread/pthread_rwlock_unlock.c \
+        thread/pthread_rwlock_wrlock.c \
+        thread/pthread_rwlockattr_destroy.c \
+        thread/pthread_rwlockattr_init.c \
+        thread/pthread_rwlockattr_setpshared.c \
         thread/pthread_testcancel.c \
         thread/sem_destroy.c \
         thread/sem_getvalue.c \

expected/wasm32-wasi/posix/defined-symbols.txt

@@ -186,6 +186,13 @@ __pthread_mutex_timedlock
 __pthread_mutex_trylock
 __pthread_mutex_trylock_owner
 __pthread_mutex_unlock
+__pthread_rwlock_rdlock
+__pthread_rwlock_timedrdlock
+__pthread_rwlock_timedwrlock
+__pthread_rwlock_tryrdlock
+__pthread_rwlock_trywrlock
+__pthread_rwlock_unlock
+__pthread_rwlock_wrlock
 __pthread_setcancelstate
 __pthread_testcancel
 __putenv
@@ -948,6 +955,18 @@ pthread_mutexattr_setprotocol
 pthread_mutexattr_setpshared
 pthread_mutexattr_setrobust
 pthread_mutexattr_settype
+pthread_rwlock_destroy
+pthread_rwlock_init
+pthread_rwlock_rdlock
+pthread_rwlock_timedrdlock
+pthread_rwlock_timedwrlock
+pthread_rwlock_tryrdlock
+pthread_rwlock_trywrlock
+pthread_rwlock_unlock
+pthread_rwlock_wrlock
+pthread_rwlockattr_destroy
+pthread_rwlockattr_init
+pthread_rwlockattr_setpshared
 pthread_setcancelstate
 pthread_testcancel
 putc