Warn when configured maxmemory value seems odd.

[redis.git] / src / zmalloc.c

diff --git a/src/zmalloc.c b/src/zmalloc.c
index 970677355f26656742b8ffc1c3071ec6a5c3e264..43d60a9c6691942043f396dafadce83f5b985497 100644 (file)
--- a/src/zmalloc.c
+++ b/src/zmalloc.c
@@ -30,6 +30,15 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+
+/* This function provide us access to the original libc free(). This is useful
+ * for instance to free results obtained by backtrace_symbols(). We need
+ * to define this function before including zmalloc.h that may shadow the
+ * free implementation if we use jemalloc or another non standard allocator. */
+void zlibc_free(void *ptr) {
+    free(ptr);
+}
+
 #include <string.h>
 #include <pthread.h>
 #include "config.h"
@@ -100,17 +109,19 @@ static size_t used_memory = 0;
 static int zmalloc_thread_safe = 0;
 pthread_mutex_t used_memory_mutex = PTHREAD_MUTEX_INITIALIZER;
 
-static void zmalloc_oom(size_t size) {
+static void zmalloc_default_oom(size_t size) {
     fprintf(stderr, "zmalloc: Out of memory trying to allocate %zu bytes\n",
         size);
     fflush(stderr);
     abort();
 }
 
+static void (*zmalloc_oom_handler)(size_t) = zmalloc_default_oom;
+
 void *zmalloc(size_t size) {
     void *ptr = malloc(size+PREFIX_SIZE);
 
-    if (!ptr) zmalloc_oom(size);
+    if (!ptr) zmalloc_oom_handler(size);
 #ifdef HAVE_MALLOC_SIZE
     update_zmalloc_stat_alloc(zmalloc_size(ptr),size);
     return ptr;
@@ -124,7 +135,7 @@ void *zmalloc(size_t size) {
 void *zcalloc(size_t size) {
     void *ptr = calloc(1, size+PREFIX_SIZE);
 
-    if (!ptr) zmalloc_oom(size);
+    if (!ptr) zmalloc_oom_handler(size);
 #ifdef HAVE_MALLOC_SIZE
     update_zmalloc_stat_alloc(zmalloc_size(ptr),size);
     return ptr;
@@ -146,7 +157,7 @@ void *zrealloc(void *ptr, size_t size) {
 #ifdef HAVE_MALLOC_SIZE
     oldsize = zmalloc_size(ptr);
     newptr = realloc(ptr,size);
-    if (!newptr) zmalloc_oom(size);
+    if (!newptr) zmalloc_oom_handler(size);
 
     update_zmalloc_stat_free(oldsize);
     update_zmalloc_stat_alloc(zmalloc_size(newptr),size);
@@ -155,7 +166,7 @@ void *zrealloc(void *ptr, size_t size) {
     realptr = (char*)ptr-PREFIX_SIZE;
     oldsize = *((size_t*)realptr);
     newptr = realloc(realptr,size+PREFIX_SIZE);
-    if (!newptr) zmalloc_oom(size);
+    if (!newptr) zmalloc_oom_handler(size);
 
     *((size_t*)newptr) = size;
     update_zmalloc_stat_free(oldsize);
@@ -227,6 +238,10 @@ void zmalloc_enable_thread_safeness(void) {
     zmalloc_thread_safe = 1;
 }
 
+void zmalloc_set_oom_handler(void (*oom_handler)(size_t)) {
+    zmalloc_oom_handler = oom_handler;
+}
+
 /* Get the RSS information in an OS-specific way.
  *
  * WARNING: the function zmalloc_get_rss() is not designed to be fast