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Add shared memory apis to redbean

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You can now do things like implement mutexes using futexes in your
redbean lua code. This provides the fastest possible inter-process
communication for your production systems when SQLite alone as ipc
or things like pipes aren't sufficient.
This commit is contained in:
Justine Tunney 2022-10-06 04:55:26 -07:00
parent 81ee11a16e
commit 7822917fc2
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GPG key ID: BE714B4575D6E328
21 changed files with 988 additions and 23 deletions
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1
third_party/nsync/atomic.internal.h vendored
View file

@ -1,6 +1,7 @@
#ifndef NSYNC_ATOMIC_INTERNAL_H_
#define NSYNC_ATOMIC_INTERNAL_H_
#include "libc/intrin/atomic.h"
#include "libc/intrin/cmpxchg.h"
#include "third_party/nsync/atomic.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_

6
third_party/nsync/futex.c vendored
View file

@ -106,7 +106,7 @@ int nsync_futex_wait_ (int *p, int expect, char pshare, struct timespec *timeout
uint32_t ms;
int rc, op, fop;
if (!FUTEX_IS_SUPPORTED) {
if (!FUTEX_IS_SUPPORTED || (IsWindows() && pshare)) {
nsync_yield_ ();
if (timeout) {
return -EINTR;
@ -166,12 +166,12 @@ int nsync_futex_wait_ (int *p, int expect, char pshare, struct timespec *timeout
}
int nsync_futex_wake_ (int *p, int count, char pshare) {
int rc, op, fop;
int e, rc, op, fop;
int wake (void *, int, int) asm ("_futex");
ASSERT (count == 1 || count == INT_MAX);
if (!FUTEX_IS_SUPPORTED) {
if (!FUTEX_IS_SUPPORTED || (IsWindows() && pshare)) {
nsync_yield_ ();
return 0;
}

3
third_party/nsync/malloc.c vendored
View file

@ -21,6 +21,7 @@
#include "libc/intrin/extend.internal.h"
#include "libc/macros.internal.h"
#include "libc/runtime/memtrack.internal.h"
#include "libc/sysv/consts/map.h"
#include "third_party/nsync/common.internal.h"
#include "third_party/nsync/malloc.internal.h"
// clang-format off
@ -45,7 +46,7 @@ void *nsync_malloc_ (size_t size) {
if (!nsync_malloc_endptr_) nsync_malloc_endptr_ = start;
nsync_malloc_endptr_ =
_extend (start, nsync_malloc_total_, nsync_malloc_endptr_,
kMemtrackNsyncStart + kMemtrackNsyncSize);
MAP_PRIVATE, kMemtrackNsyncStart + kMemtrackNsyncSize);
atomic_store_explicit (&nsync_malloc_lock_, 0, memory_order_relaxed);
return start + offset;
}

2
third_party/nsync/mu_semaphore.h vendored
View file

@ -5,7 +5,7 @@
COSMOPOLITAN_C_START_
typedef struct nsync_semaphore_s_ {
void *sem_space[32]; /* space used by implementation */
void *sem_space[1]; /* [jart] reduced to 8 bytes */
} nsync_semaphore;
/* Initialize *s; the initial value is 0. */