From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Wed, 29 Jun 2011 20:38:06 +0000 (-0400)
Subject: urcu-bp: add mremap wrapper for non-linux systems
X-Git-Tag: v0.6.4~6
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=45a4872f3dfacfa47095c1044cabc5eb2a240696;p=userspace-rcu.git

urcu-bp: add mremap wrapper for non-linux systems

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/urcu-bp.c b/urcu-bp.c
index 2973574..2b531a3 100644
--- a/urcu-bp.c
+++ b/urcu-bp.c
@@ -45,6 +45,35 @@
 #define MAP_ANONYMOUS MAP_ANON
 #endif
 
+#ifndef __linux__
+
+#define MREMAP_MAYMOVE	1
+#define MREMAP_FIXED	2
+
+/*
+ * mremap wrapper for non-Linux systems. Maps a RW, anonymous private mapping.
+ * This is not generic.
+*/
+void *mremap(void *old_address, size_t old_size, size_t new_size, int flags)
+{
+	void *new_arena;
+
+	assert(flags & MREMAP_MAYMOVE);
+	assert(!(flags & MREMAP_FIXED));
+	new_address = mmap(old_address, new_size,
+			   PROT_READ | PROT_WRITE,
+			   MAP_ANONYMOUS | MAP_PRIVATE,
+			   -1, 0);
+	if (new_address == MAP_FAILED)
+		return MAP_FAILED;
+	if (old_address) {
+		memcpy(new_address, old_address, old_size);
+		munmap(old_address, old_size);
+	}
+	return new_address;
+}
+#endif
+
 /* Sleep delay in us */
 #define RCU_SLEEP_DELAY		1000
 #define ARENA_INIT_ALLOC	16