skynet-src/skynet_mq.c racing condition

[jigsawecho]

Memory barrier is not properly used, which introduces potential racing condition.
There are several issues listed below:

1. Full barrier at line 57 CAN be replaced with a write barrier.
2. Full barrier at line 59 is not needed at all.
3. Full barrier at line 80 is not needed at all
4. Read barrier MUST be inserted before line 75.

[cloudwu]

Thanks,
It seems that there is no build-in write barrier in C. How can I replace a write barrier ?

http://gcc.gnu.org/onlinedocs/gcc-4.1.0/gcc/Atomic-Builtins.html

.

[jigsawecho]

Ref: http://lxr.free-electrons.com/source/arch/x86/include/asm/barrier.h

[cloudwu]

I would like use build-in function rather than asm code :)