X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=liblttng-ust-libc-wrapper%2Flttng-ust-malloc.c;h=f30a2c694372970c7f68581364075a67534dbeb4;hb=553bbf7f38652084ed7966c7817b8ccb372b14e1;hp=d1ad3cf5b146260cf93548df5bf2a41ae9358057;hpb=171fcc6fd03e3f5787b3d0ee8aedc8cb9bcc6f17;p=lttng-ust.git

diff --git a/liblttng-ust-libc-wrapper/lttng-ust-malloc.c b/liblttng-ust-libc-wrapper/lttng-ust-malloc.c
index d1ad3cf5..f30a2c69 100644
--- a/liblttng-ust-libc-wrapper/lttng-ust-malloc.c
+++ b/liblttng-ust-libc-wrapper/lttng-ust-malloc.c
@@ -18,6 +18,11 @@
  */
 
 #define _GNU_SOURCE
+/*
+ * Do _not_ define _LGPL_SOURCE because we don't want to create a
+ * circular dependency loop between this malloc wrapper, liburcu and
+ * libc.
+ */
 #include <lttng/ust-dlfcn.h>
 #include <sys/types.h>
 #include <stdio.h>
@@ -90,7 +95,7 @@ void ust_malloc_spin_unlock(pthread_mutex_t *lock)
 #define calloc static_calloc
 #define pthread_mutex_lock ust_malloc_spin_lock
 #define pthread_mutex_unlock ust_malloc_spin_unlock
-static DEFINE_URCU_TLS(int, malloc_nesting);
+static DEFINE_URCU_TLS_IE(int, malloc_nesting);
 #undef ust_malloc_spin_unlock
 #undef ust_malloc_spin_lock
 #undef calloc
@@ -416,6 +421,12 @@ int posix_memalign(void **memptr, size_t alignment, size_t size)
 	return retval;
 }
 
+static
+void lttng_ust_fixup_malloc_nesting_tls(void)
+{
+	asm volatile ("" : : "m" (URCU_TLS(malloc_nesting)));
+}
+
 __attribute__((constructor))
 void lttng_ust_malloc_wrapper_init(void)
 {
@@ -423,6 +434,7 @@ void lttng_ust_malloc_wrapper_init(void)
 	if (cur_alloc.calloc) {
 		return;
 	}
+	lttng_ust_fixup_malloc_nesting_tls();
 	/*
 	 * Ensure the allocator is in place before the process becomes
 	 * multithreaded.