Revert "[libc] Implement barriers for pthreads" (llvm#151014)

Reverts llvm#148948

Author: uzairnawaz

libc/config/linux/x86_64/entrypoints.txt

@@ -1050,9 +1050,6 @@ if(LLVM_LIBC_FULL_BUILD)
     libc.src.pthread.pthread_join
     libc.src.pthread.pthread_key_create
     libc.src.pthread.pthread_key_delete
-    libc.src.pthread.pthread_barrier_init
-    libc.src.pthread.pthread_barrier_wait
-    libc.src.pthread.pthread_barrier_destroy
     libc.src.pthread.pthread_mutex_destroy
     libc.src.pthread.pthread_mutex_init
     libc.src.pthread.pthread_mutex_lock

libc/hdr/CMakeLists.txt

@@ -72,15 +72,6 @@ add_proxy_header_library(
     libc.include.fenv
 )
 
-add_proxy_header_library(
-  pthread_macros
-  HDRS
-    pthread_macros.h
-  FULL_BUILD_DEPENDS
-    libc.include.llvm-libc-macros.pthread_macros
-    libc.include.pthread
-)
-
 add_proxy_header_library(
   sched_macros
   HDRS

libc/hdr/pthread_macros.h

@@ -241,22 +241,6 @@ add_proxy_header_library(
     libc.include.llvm-libc-types.pid_t
 )
 
-add_proxy_header_library(
-  pthread_barrier_t
-  HDRS
-    pthread_barrier_t.h
-  FULL_BUILD_DEPENDS
-    libc.include.llvm-libc-types.pthread_barrier_t
-)
-
-add_proxy_header_library(
-  pthread_barrierattr_t
-  HDRS
-    pthread_barrierattr_t.h
-  FULL_BUILD_DEPENDS
-    libc.include.llvm-libc-types.pthread_barrierattr_t
-)
-
 add_proxy_header_library(
   atexithandler_t
   HDRS

libc/hdr/types/CMakeLists.txt

@@ -392,8 +392,6 @@ add_header_macro(
     .llvm-libc-types.pthread_attr_t
     .llvm-libc-types.pthread_condattr_t
     .llvm-libc-types.pthread_key_t
-    .llvm-libc-types.pthread_barrier_t
-    .llvm-libc-types.pthread_barrierattr_t
     .llvm-libc-types.pthread_mutex_t
     .llvm-libc-types.pthread_mutexattr_t
     .llvm-libc-types.pthread_once_t

libc/hdr/types/pthread_barrier_t.h

@@ -22,8 +22,6 @@
 #define PTHREAD_MUTEX_STALLED 0
 #define PTHREAD_MUTEX_ROBUST 1
 
-#define PTHREAD_BARRIER_SERIAL_THREAD -1
-
 #define PTHREAD_ONCE_INIT {0}
 
 #define PTHREAD_PROCESS_PRIVATE 0

libc/hdr/types/pthread_barrierattr_t.h

@@ -10,7 +10,6 @@ add_header(__exec_envp_t HDR __exec_envp_t.h)
 add_header(__futex_word HDR __futex_word.h)
 add_header(pid_t HDR pid_t.h)
 add_header(__mutex_type HDR __mutex_type.h DEPENDS .__futex_word .pid_t)
-add_header(__barrier_type HDR __barrier_type.h)
 add_header(__pthread_once_func_t HDR __pthread_once_func_t.h)
 add_header(__pthread_start_t HDR __pthread_start_t.h)
 add_header(__pthread_tss_dtor_t HDR __pthread_tss_dtor_t.h)
@@ -54,8 +53,6 @@ add_header(pthread_condattr_t HDR pthread_condattr_t.h DEPENDS .clockid_t)
 add_header(pthread_key_t HDR pthread_key_t.h)
 add_header(pthread_mutex_t HDR pthread_mutex_t.h DEPENDS .__futex_word .__mutex_type)
 add_header(pthread_mutexattr_t HDR pthread_mutexattr_t.h)
-add_header(pthread_barrier_t HDR pthread_barrier_t.h)
-add_header(pthread_barrierattr_t HDR pthread_barrierattr_t.h)
 add_header(pthread_once_t HDR pthread_once_t.h DEPENDS .__futex_word)
 add_header(pthread_rwlock_t HDR pthread_rwlock_t.h DEPENDS .__futex_word .pid_t)
 add_header(pthread_rwlockattr_t HDR pthread_rwlockattr_t.h)