Changeset d51cca8 in mainline for uspace/lib/c/include/barrier.h

Timestamp:

2018-09-06T17:20:15Z (6 years ago)

Author:

Jiří Zárevúcky <jiri.zarevucky@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

7328ff4

Parents:

f8048d1

git-author:

Jiří Zárevúcky <jiri.zarevucky@…> (2018-08-11 22:57:32)

git-committer:

Jiří Zárevúcky <jiri.zarevucky@…> (2018-09-06 17:20:15)

Message:

Use <stdatomic.h> to implement uspace barriers.

File:

• uspace/lib/c/include/barrier.h (modified) (1 diff)

uspace/lib/c/include/barrier.h

@@ -36 +36 @@
 #define LIBC_COMPILER_BARRIER_H_
 
-#include <libarch/barrier.h>
+#include <stdatomic.h>
 
 extern void smp_memory_barrier(void);
 
-#define compiler_barrier() asm volatile ("" ::: "memory")
+static inline void compiler_barrier(void)
+{
+        atomic_signal_fence(memory_order_seq_cst);
+}
+
+static inline void memory_barrier(void)
+{
+        atomic_thread_fence(memory_order_seq_cst);
+}
+
+static inline void read_barrier(void)
+{
+        atomic_thread_fence(memory_order_acquire);
+}
+
+static inline void write_barrier(void)
+{
+        atomic_thread_fence(memory_order_release);
+}
 
 /** Forces the compiler to access (ie load/store) the variable only once. */