From: Vincent Pit <vince@profvince.com>
Date: Mon, 6 Apr 2015 19:50:50 +0000 (-0300)
Subject: Make sure we don't take the OP_REFCNT mutex twice on perl 5.9.2 and below
X-Git-Tag: v0.35~5
X-Git-Url: http://git.vpit.fr/?p=perl%2Fmodules%2Findirect.git;a=commitdiff_plain;h=7645d1927c141596242b284b6fba4213264e5775

Make sure we don't take the OP_REFCNT mutex twice on perl 5.9.2 and below
---

diff --git a/indirect.xs b/indirect.xs
index 485c331..bd52eee 100644
--- a/indirect.xs
+++ b/indirect.xs
@@ -151,12 +151,33 @@
 # define MY_CXT_CLONE NOOP
 #endif
 
+#if I_THREADSAFE
+/* We must use preexistent global mutexes or we will never be able to destroy
+ * them. */
+# if I_HAS_PERL(5, 9, 3)
+#  define I_LOADED_LOCK   MUTEX_LOCK(&PL_my_ctx_mutex)
+#  define I_LOADED_UNLOCK MUTEX_UNLOCK(&PL_my_ctx_mutex)
+# else
+#  define I_LOADED_LOCK   OP_REFCNT_LOCK
+#  define I_LOADED_UNLOCK OP_REFCNT_UNLOCK
+# endif
+#else
+# define I_LOADED_LOCK   NOOP
+# define I_LOADED_UNLOCK NOOP
+#endif
+
 #if defined(OP_CHECK_MUTEX_LOCK) && defined(OP_CHECK_MUTEX_UNLOCK)
 # define I_CHECK_MUTEX_LOCK   OP_CHECK_MUTEX_LOCK
 # define I_CHECK_MUTEX_UNLOCK OP_CHECK_MUTEX_UNLOCK
-#else
+#elif I_HAS_PERL(5, 9, 3)
 # define I_CHECK_MUTEX_LOCK   OP_REFCNT_LOCK
 # define I_CHECK_MUTEX_UNLOCK OP_REFCNT_UNLOCK
+#else
+/* Before perl 5.9.3, indirect_ck_*() calls are already protected by the
+ * I_LOADED mutex, which falls back to the OP_REFCNT mutex. Make sure we don't
+ * lock it twice. */
+# define I_CHECK_MUTEX_LOCK   NOOP
+# define I_CHECK_MUTEX_UNLOCK NOOP
 #endif
 
 typedef OP *(*indirect_ck_t)(pTHX_ OP *);
@@ -208,16 +229,6 @@ static U32 indirect_loaded = 0;
 
 static ptable *indirect_loaded_cxts = NULL;
 
-/* We must use preexistent global mutexes or we will never be able to destroy
- * them. */
-#if I_HAS_PERL(5, 9, 3)
-# define I_LOADED_LOCK   MUTEX_LOCK(&PL_my_ctx_mutex)
-# define I_LOADED_UNLOCK MUTEX_UNLOCK(&PL_my_ctx_mutex)
-#else
-# define I_LOADED_LOCK   OP_REFCNT_LOCK
-# define I_LOADED_UNLOCK OP_REFCNT_UNLOCK
-#endif
-
 static int indirect_is_loaded(pTHX_ void *cxt) {
 #define indirect_is_loaded(C) indirect_is_loaded(aTHX_ (C))
  int res = 0;
@@ -266,9 +277,6 @@ static int indirect_clear_loaded_locked(pTHX_ void *cxt) {
 
 #else
 
-#define I_LOADED_LOCK   NOOP
-#define I_LOADED_UNLOCK NOOP
-
 #define indirect_is_loaded(C)           (indirect_loaded > 0)
 #define indirect_set_loaded_locked(C)   ((indirect_loaded++ <= 0) ? 1 : 0)
 #define indirect_clear_loaded_locked(C) ((--indirect_loaded <= 0) ? 1 : 0)