X-Git-Url: http://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=urcu-bp.c;h=f3249b43b313decebc29e193b5c82ebf1114a735;hp=543a9f3ae01775b18008e4e2140513116bd2e781;hb=53dae82521cfd35f6df58b85bd7f39f2aa20a231;hpb=4c1ae2ea760611f4d2b658b4e6b374f597c1c1f9

diff --git a/urcu-bp.c b/urcu-bp.c
index 543a9f3..f3249b4 100644
--- a/urcu-bp.c
+++ b/urcu-bp.c
@@ -24,6 +24,7 @@
  */
 
 #define _GNU_SOURCE
+#define _LGPL_SOURCE
 #include <stdio.h>
 #include <pthread.h>
 #include <signal.h>
@@ -35,20 +36,58 @@
 #include <unistd.h>
 #include <sys/mman.h>
 
+#include "urcu/wfqueue.h"
 #include "urcu/map/urcu-bp.h"
-
 #include "urcu/static/urcu-bp.h"
+#include "urcu-pointer.h"
+
 /* Do not #define _LGPL_SOURCE to ensure we can emit the wrapper symbols */
+#undef _LGPL_SOURCE
 #include "urcu-bp.h"
+#define _LGPL_SOURCE
 
 #ifndef MAP_ANONYMOUS
 #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_address;
+
+	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
 
+/*
+ * Active attempts to check for reader Q.S. before calling sleep().
+ */
+#define RCU_QS_ACTIVE_ATTEMPTS 100
+
 void __attribute__((destructor)) rcu_bp_exit(void);
 
 static pthread_mutex_t rcu_gp_lock = PTHREAD_MUTEX_INITIALIZER;
@@ -254,7 +293,6 @@ static void resize_arena(struct registry_arena *arena, size_t len)
 	if (new_arena == arena->p)
 		return;
 
-	memcpy(new_arena, arena->p, arena->len);
 	bzero(new_arena + arena->len, len - arena->len);
 	arena->p = new_arena;
 }
@@ -267,7 +305,7 @@ static void add_thread(void)
 	if (registry_arena.len
 	    < registry_arena.used + sizeof(struct rcu_reader))
 		resize_arena(&registry_arena,
-		max(registry_arena.len << 1, ARENA_INIT_ALLOC));
+		caa_max(registry_arena.len << 1, ARENA_INIT_ALLOC));
 	/*
 	 * Find a free spot.
 	 */
@@ -336,9 +374,10 @@ end:
 	assert(!ret);
 }
 
-void rcu_bp_exit()
+void rcu_bp_exit(void)
 {
-	munmap(registry_arena.p, registry_arena.len);
+	if (registry_arena.p)
+		munmap(registry_arena.p, registry_arena.len);
 }
 
 /*
@@ -382,5 +421,28 @@ void rcu_bp_after_fork_child(void)
 	assert(!ret);
 }
 
+void *rcu_dereference_sym_bp(void *p)
+{
+	return _rcu_dereference(p);
+}
+
+void *rcu_set_pointer_sym_bp(void **p, void *v)
+{
+	cmm_wmb();
+	return uatomic_set(p, v);
+}
+
+void *rcu_xchg_pointer_sym_bp(void **p, void *v)
+{
+	cmm_wmb();
+	return uatomic_xchg(p, v);
+}
+
+void *rcu_cmpxchg_pointer_sym_bp(void **p, void *old, void *_new)
+{
+	cmm_wmb();
+	return uatomic_cmpxchg(p, old, _new);
+}
+
 #include "urcu-call-rcu-impl.h"
 #include "urcu-defer-impl.h"