romenskiy2012/jemalloc
1
0
Fork 0
mirror of https://github.com/jemalloc/jemalloc.git synced 2026-08-18 05:13:53 +03:00
Code Issues Projects Releases Packages Wiki Activity

Move process write part (atfork) to OS layer

Browse source 
Migrates pthread_atfork(3) registration onto the existing os/process.h
dispatcher.
This commit is contained in:
guangli-dai 2026-07-27 17:41:42 -07:00 • committed by Guangli Dai
parent 85599c8b12
commit 89b9aef8f7
4 changed files with 55 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

27
include/jemalloc/internal/os/posix/process.h
View file

@ -14,4 +14,31 @@ os_process_id(void) {
return (int)getpid();
}
/*
* Shared by every POSIX platform: the four predicates below reproduce, in one
* place, exactly which platforms actually get pthread_atfork() registered.
* - JEMALLOC_HAVE_PTHREAD_ATFORK: the function exists.
* - !JEMALLOC_MUTEX_INIT_CB: on FreeBSD-libthr, _pthread_mutex_init_calloc_cb
* makes libthr's own _malloc_prefork/_malloc_postfork drive the fork
* dance instead. Registering here would be redundant.
* - !JEMALLOC_ZONE: on Darwin, malloc-zone fork callbacks subsume
* pthread_atfork.
* - !__native_client__: Native Client's sandbox doesn't support fork() at
* all, and pthread_atfork() risked being an unresolved symbol in some
* NaCl toolchains. Registering it is both pointless and unsafe there.
*/
JEMALLOC_ALWAYS_INLINE bool
os_process_register_atfork(void (*prepare)(void), void (*parent)(void),
void (*child)(void)) {
#if defined(JEMALLOC_HAVE_PTHREAD_ATFORK) && !defined(JEMALLOC_MUTEX_INIT_CB) \
&& !defined(JEMALLOC_ZONE) && !defined(__native_client__)
return pthread_atfork(prepare, parent, child) != 0;
#else
(void)prepare;
(void)parent;
(void)child;
return false;
#endif
}
#endif /* JEMALLOC_INTERNAL_OS_POSIX_PROCESS_H */

6
include/jemalloc/internal/os/process.h
View file

@ -11,6 +11,12 @@
/* Functions required for implementation in each backend. */
JEMALLOC_ALWAYS_INLINE int os_process_id(void);
/*
* Install fork handlers, returning true on failure. A no-op returning false
* where fork handler registration doesn't apply.
*/
JEMALLOC_ALWAYS_INLINE bool os_process_register_atfork(
void (*prepare)(void), void (*parent)(void), void (*child)(void));
#if defined(_WIN32)
# include "jemalloc/internal/os/windows/process.h"

10
include/jemalloc/internal/os/windows/process.h
View file

@ -12,4 +12,14 @@ os_process_id(void) {
return (int)GetCurrentProcessId();
}
/* Windows has no fork(2)/pthread_atfork; always a no-op. */
JEMALLOC_ALWAYS_INLINE bool
os_process_register_atfork(void (*prepare)(void), void (*parent)(void),
void (*child)(void)) {
(void)prepare;
(void)parent;
(void)child;
return false;
}
#endif /* JEMALLOC_INTERNAL_OS_WINDOWS_PROCESS_H */