From: Willy Tarreau <w@1wt.eu>
Date: Tue, 31 Oct 2017 17:00:20 +0000 (+0100)
Subject: MINOR: threads: add a portable barrier for threads and non-threads
X-Git-Tag: v1.8-rc1~101
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b29dc95a9748732898996540768bbed7a01f9a03;p=thirdparty%2Fhaproxy.git

MINOR: threads: add a portable barrier for threads and non-threads

HA_BARRIER() is just a simple memory barrier to prevent the compiler
from reordering our code.
---

diff --git a/include/common/hathreads.h b/include/common/hathreads.h
index 25c1737e1e..3524ef189c 100644
--- a/include/common/hathreads.h
+++ b/include/common/hathreads.h
@@ -60,6 +60,7 @@ extern THREAD_LOCAL unsigned int tid_bit; /* The bit corresponding to the thread
 		*(val);							\
 	})
 
+#define HA_BARRIER() do { } while (0)
 
 #define THREAD_SYNC_INIT(m)  do { /* do nothing */ } while(0)
 #define THREAD_SYNC_ENABLE() do { /* do nothing */ } while(0)
@@ -118,6 +119,8 @@ extern THREAD_LOCAL unsigned int tid_bit; /* The bit corresponding to the thread
 		(*val);							\
 	})
 
+#define HA_BARRIER() pl_barrier()
+
 #define THREAD_SYNC_INIT(m)   thread_sync_init(m)
 #define THREAD_SYNC_ENABLE()  thread_sync_enable()
 #define THREAD_WANT_SYNC()    thread_want_sync()