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Make fork() go 30% faster

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This change makes fork() go nearly as fast as sys_fork() on UNIX. As for
Windows this change shaves about 4-5ms off fork() + wait() latency. This
is accomplished by using WriteProcessMemory() from the parent process to
setup the address space of a suspended process; it is better than a pipe
This commit is contained in:
Justine Tunney 2025-01-01 04:59:38 -08:00
parent 98c5847727
commit 0b3c81dd4e
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
44 changed files with 769 additions and 649 deletions
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16
third_party/gdtoa/lock.c vendored
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@ -32,8 +32,8 @@
#include "libc/thread/posixthread.internal.h"
#include "third_party/gdtoa/lock.h"
pthread_mutex_t __gdtoa_lock_obj = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t __gdtoa_lock1_obj = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t __gdtoa_lock_obj = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t __gdtoa_lock1_obj = PTHREAD_MUTEX_INITIALIZER;
void
__gdtoa_lock(void)
@ -47,6 +47,12 @@ __gdtoa_unlock(void)
_pthread_mutex_unlock(&__gdtoa_lock_obj);
}
void
__gdtoa_wipe(void)
{
_pthread_mutex_wipe_np(&__gdtoa_lock_obj);
}
void
__gdtoa_lock1(void)
{
@ -58,3 +64,9 @@ __gdtoa_unlock1(void)
{
_pthread_mutex_unlock(&__gdtoa_lock1_obj);
}
void
__gdtoa_wipe1(void)
{
_pthread_mutex_wipe_np(&__gdtoa_lock1_obj);
}

6
third_party/gdtoa/lock.h vendored
View file

@ -3,13 +3,13 @@
#include "libc/thread/thread.h"
COSMOPOLITAN_C_START_
extern pthread_mutex_t __gdtoa_lock_obj;
extern pthread_mutex_t __gdtoa_lock1_obj;
void __gdtoa_lock(void);
void __gdtoa_unlock(void);
void __gdtoa_wipe(void);
void __gdtoa_lock1(void);
void __gdtoa_unlock1(void);
void __gdtoa_wipe1(void);
COSMOPOLITAN_C_END_
#endif /* COSMOPOLITAN_THIRD_PARTY_GDTOA_LOCK_H_ */