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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
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
21 changed files with 988 additions and 23 deletions
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2
libc/calls/reservefd.c
View file

@ -49,7 +49,7 @@ int __ensurefds_unlocked(int fd) {
bool relocate;
if (fd < g_fds.n) return fd;
g_fds.n = fd + 1;
g_fds.e = _extend(g_fds.p, g_fds.n * sizeof(*g_fds.p), g_fds.e,
g_fds.e = _extend(g_fds.p, g_fds.n * sizeof(*g_fds.p), g_fds.e, MAP_PRIVATE,
kMemtrackFdsStart + kMemtrackFdsSize);
return fd;
}

11
libc/intrin/extend.c
View file

@ -29,11 +29,11 @@
#define G FRAMESIZE
static void _mapframe(void *p) {
static void _mapframe(void *p, int f) {
int prot, flags;
struct DirectMap dm;
prot = PROT_READ | PROT_WRITE;
flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED;
flags = f | MAP_ANONYMOUS | MAP_FIXED;
if ((dm = sys_mmap(p, G, prot, flags, -1, 0)).addr != p) {
notpossible;
}
@ -60,9 +60,10 @@ static void _mapframe(void *p) {
* @param n specifies how many bytes are needed
* @param e points to end of memory that's allocated
* @param h is highest address to which `e` may grow
* @param f should be `MAP_PRIVATE` or `MAP_SHARED`
* @return new value for `e`
*/
noasan void *_extend(void *p, size_t n, void *e, intptr_t h) {
noasan void *_extend(void *p, size_t n, void *e, int f, intptr_t h) {
char *q;
#ifndef NDEBUG
if ((uintptr_t)SHADOW(p) & (G - 1)) notpossible;
@ -71,10 +72,10 @@ noasan void *_extend(void *p, size_t n, void *e, intptr_t h) {
for (q = e; q < ((char *)p + n); q += 8) {
if (!((uintptr_t)q & (G - 1))) {
if (q + G > (char *)h) notpossible;
_mapframe(q);
_mapframe(q, f);
if (IsAsan()) {
if (!((uintptr_t)SHADOW(q) & (G - 1))) {
_mapframe(SHADOW(q));
_mapframe(SHADOW(q), f);
__asan_poison(q, G << kAsanScale, kAsanProtected);
}
}

2
libc/intrin/extend.internal.h
View file

@ -3,7 +3,7 @@
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
void *_extend(void *, size_t, void *, intptr_t);
void *_extend(void *, size_t, void *, int, intptr_t);
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */

3
libc/intrin/g_fds.c
View file

@ -23,6 +23,7 @@
#include "libc/intrin/weaken.h"
#include "libc/nt/runtime.h"
#include "libc/runtime/memtrack.internal.h"
#include "libc/sysv/consts/map.h"
#include "libc/sysv/consts/o.h"
#include "libc/thread/thread.h"
@ -47,7 +48,7 @@ textstartup void InitializeFileDescriptors(void) {
fds->p = fds->e = (void *)kMemtrackFdsStart;
fds->n = 4;
fds->f = 3;
fds->e = _extend(fds->p, fds->n * sizeof(*fds->p), fds->e,
fds->e = _extend(fds->p, fds->n * sizeof(*fds->p), fds->e, MAP_PRIVATE,
kMemtrackFdsStart + kMemtrackFdsSize);
if (IsMetal()) {
extern const char vga_console[];

2
libc/intrin/sched_yield.S
View file

@ -21,7 +21,7 @@
#include "libc/macros.internal.h"
.privileged
// Asks kernel to let other threads be scheduled.
// Relinquishes scheduled quantum.
//
// @return 0 on success, or -1 w/ errno
// @norestart

31
libc/intrin/sys_umtx_op.S Normal file
View file

@ -0,0 +1,31 @@
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/macros.internal.h"
.privileged
// Calls FreeBSD's futex() API.
// Normalizes return value to Linux ABI -errno convention.
sys_umtx_op:
mov $0x1c6,%eax
syscall
jc 1f
ret
1: neg %eax
ret
.endfn sys_umtx_op,globl,hidden

2
libc/sysv/calls/sys_clock_nanosleep.s
View file

@ -1,2 +1,2 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_clock_nanosleep,0x1ddfff0f4ffff0e6,globl
.scall sys_clock_nanosleep,0x1ddfff0f4ffff0e6,globl,hidden

2
libc/sysv/calls/sys_umtx_op.s
View file

@ -1,2 +0,0 @@
.include "o/libc/sysv/macros.internal.inc"
.scall sys_umtx_op,0xffffff1c6fffffff,globl

2
libc/sysv/syscalls.sh
View file

@ -642,7 +642,7 @@ scall sys_bsdthread_register 0xfffffffff216efff globl hidden
#scall write_nocancel 0xfffffffff218dfff globl
#scall writev_nocancel 0xfffffffff219cfff globl
#──────────────────────────FREEBSD───────────────────────────
scall sys_umtx_op 0xffffff1c6fffffff globl
#scall sys_umtx_op 0xffffff1c6fffffff globl
#scall abort2 0xffffff1cffffffff globl
#scall afs3_syscall 0xffffff179fffffff globl
#scall bindat 0xffffff21afffffff globl

2
libc/zipos/open.c
View file

@ -54,7 +54,7 @@ static void *__zipos_mmap(size_t mapsize) {
maptotal += mapsize;
start = (char *)kMemtrackZiposStart;
if (!mapend) mapend = start;
mapend = _extend(start, maptotal, mapend,
mapend = _extend(start, maptotal, mapend, MAP_PRIVATE,
kMemtrackZiposStart + kMemtrackZiposSize);
return start + offset;
}