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Fix fork-related bugs.

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Acquire/release arena bin locks as part of the prefork/postfork.  This
bug made deadlock in the child between fork and exec a possibility.

Split jemalloc_postfork() into jemalloc_postfork_{parent,child}() so
that the child can reinitialize mutexes rather than unlocking them.  In
practice, this bug tended not to cause problems.
This commit is contained in:
Jason Evans
2012-03-13 16:31:41 -07:00
parent 824d34e5b7
commit 4e2e3dd9cf
13 changed files with 194 additions and 38 deletions
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36
src/chunk_dss.c
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@@ -3,14 +3,18 @@
/******************************************************************************/
/* Data. */
malloc_mutex_t dss_mtx;
/*
* Protects sbrk() calls. This avoids malloc races among threads, though it
* does not protect against races with threads that call sbrk() directly.
*/
static malloc_mutex_t dss_mtx;
/* Base address of the DSS. */
static void *dss_base;
static void *dss_base;
/* Current end of the DSS, or ((void *)-1) if the DSS is exhausted. */
static void *dss_prev;
static void *dss_prev;
/* Current upper limit on DSS addresses. */
static void *dss_max;
static void *dss_max;
/*
* Trees of chunks that were previously allocated (trees differ only in node
@@ -291,4 +295,28 @@ chunk_dss_boot(void)
return (false);
}
void
chunk_dss_prefork(void)
{
if (config_dss)
malloc_mutex_prefork(&dss_mtx);
}
void
chunk_dss_postfork_parent(void)
{
if (config_dss)
malloc_mutex_postfork_parent(&dss_mtx);
}
void
chunk_dss_postfork_child(void)
{
if (config_dss)
malloc_mutex_postfork_child(&dss_mtx);
}
/******************************************************************************/