diff options
| author | Jason Evans <je@fb.com> | 2012-10-09 21:46:22 (GMT) |
|---|---|---|
| committer | Jason Evans <je@fb.com> | 2012-10-09 22:21:46 (GMT) |
| commit | 20f1fc95adb35ea63dc61f47f2b0ffbd37d39f32 (patch) | |
| tree | 9c61145b466c8f413b4f98247f17d8509e6ed8ea /include/jemalloc/internal/ctl.h | |
| parent | 7de92767c20cb72c94609b9c78985526fb84a679 (diff) | |
| download | jemalloc-20f1fc95adb35ea63dc61f47f2b0ffbd37d39f32.zip jemalloc-20f1fc95adb35ea63dc61f47f2b0ffbd37d39f32.tar.gz jemalloc-20f1fc95adb35ea63dc61f47f2b0ffbd37d39f32.tar.bz2 | |
Fix fork(2)-related deadlocks.
Add a library constructor for jemalloc that initializes the allocator.
This fixes a race that could occur if threads were created by the main
thread prior to any memory allocation, followed by fork(2), and then
memory allocation in the child process.
Fix the prefork/postfork functions to acquire/release the ctl, prof, and
rtree mutexes. This fixes various fork() child process deadlocks, but
one possible deadlock remains (intentionally) unaddressed: prof
backtracing can acquire runtime library mutexes, so deadlock is still
possible if heap profiling is enabled during fork(). This deadlock is
known to be a real issue in at least the case of libgcc-based
backtracing.
Reported by tfengjun.
Diffstat (limited to 'include/jemalloc/internal/ctl.h')
| -rw-r--r-- | include/jemalloc/internal/ctl.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/jemalloc/internal/ctl.h b/include/jemalloc/internal/ctl.h index adf3827..1d0c76a 100644 --- a/include/jemalloc/internal/ctl.h +++ b/include/jemalloc/internal/ctl.h @@ -75,6 +75,9 @@ int ctl_nametomib(const char *name, size_t *mibp, size_t *miblenp); int ctl_bymib(const size_t *mib, size_t miblen, void *oldp, size_t *oldlenp, void *newp, size_t newlen); bool ctl_boot(void); +void ctl_prefork(void); +void ctl_postfork_parent(void); +void ctl_postfork_child(void); #define xmallctl(name, oldp, oldlenp, newp, newlen) do { \ if (je_mallctl(name, oldp, oldlenp, newp, newlen) \ |