urcu call_rcu: Use RCU read-side protection for per-cpu call_rcu data

[urcu.git] / urcu-bp.c

diff --git a/urcu-bp.c b/urcu-bp.c
index 543a9f3ae01775b18008e4e2140513116bd2e781..4c0ab54a28e71b47947905d6f5f42354de0135cd 100644 (file)
--- 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);
 }
 
 /*