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authorSverker Eriksson <sverker@erlang.org>2012-09-07 19:12:44 +0200
committerSverker Eriksson <sverker@erlang.org>2012-09-07 19:12:44 +0200
commit52fcc669df315042adb1023c4cb263898af09d0e (patch)
tree8fca994735fa6844710be83e58a62e0b78f5342a /erts/emulator
parente7b04a638b7a02f03d6ac44cb559c5febc22a9a8 (diff)
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erts: Fix faulty lock check assert
Diffstat (limited to 'erts/emulator')
-rw-r--r--erts/emulator/beam/code_ix.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/erts/emulator/beam/code_ix.c b/erts/emulator/beam/code_ix.c
index 91679bfb4e..c66d5a2f05 100644
--- a/erts/emulator/beam/code_ix.c
+++ b/erts/emulator/beam/code_ix.c
@@ -36,7 +36,7 @@
erts_smp_atomic32_t the_active_code_index;
erts_smp_atomic32_t the_staging_code_index;
-static int is_code_write_locked = 0;
+static Process* code_writing_process = NULL;
struct code_write_queue_item {
Process *p;
struct code_write_queue_item* next;
@@ -114,18 +114,19 @@ int erts_try_seize_code_write_permission(Process* c_p)
#ifdef ERTS_SMP
ASSERT(!erts_smp_thr_progress_is_blocking()); /* to avoid deadlock */
#endif
+ ASSERT(c_p != NULL);
erts_smp_mtx_lock(&code_write_permission_mtx);
- success = !is_code_write_locked;
+ success = (code_writing_process == NULL);
if (success) {
- is_code_write_locked = 1;
+ code_writing_process = c_p;
#ifdef ERTS_ENABLE_LOCK_CHECK
erts_tsd_set(has_code_write_permission, (void *) 1);
#endif
}
else { /* Already locked */
struct code_write_queue_item* qitem;
- ERTS_SMP_LC_ASSERT(!erts_tsd_get(has_code_write_permission));
+ ASSERT(code_writing_process != c_p);
qitem = erts_alloc(ERTS_ALC_T_CODE_IX_LOCK_Q, sizeof(*qitem));
qitem->p = c_p;
erts_smp_proc_inc_refc(c_p);
@@ -152,7 +153,7 @@ void erts_release_code_write_permission(void)
erts_smp_proc_dec_refc(qitem->p);
erts_free(ERTS_ALC_T_CODE_IX_LOCK_Q, qitem);
}
- is_code_write_locked = 0;
+ code_writing_process = NULL;
#ifdef ERTS_ENABLE_LOCK_CHECK
erts_tsd_set(has_code_write_permission, (void *) 0);
#endif
@@ -162,6 +163,6 @@ void erts_release_code_write_permission(void)
#ifdef ERTS_ENABLE_LOCK_CHECK
int erts_has_code_write_permission(void)
{
- return is_code_write_locked && erts_tsd_get(has_code_write_permission);
+ return (code_writing_process != NULL) && erts_tsd_get(has_code_write_permission);
}
#endif