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[libc] add rwlock (llvm#94156)
1 parent cccc437 commit 41fecca

35 files changed

+1836
-5
lines changed

‎libc/config/config.json‎

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@@ -49,6 +49,10 @@
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"LIBC_CONF_RAW_MUTEX_DEFAULT_SPIN_COUNT": {
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"value": 100,
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"doc": "Default number of spins before blocking if a mutex is in contention (default to 100)."
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},
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"LIBC_CONF_RWLOCK_DEFAULT_SPIN_COUNT": {
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"value": 100,
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"doc": "Default number of spins before blocking if a rwlock is in contention (default to 100)."
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}
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}
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}

‎libc/config/linux/aarch64/entrypoints.txt‎

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@@ -645,6 +645,15 @@ if(LLVM_LIBC_FULL_BUILD)
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libc.src.pthread.pthread_mutexattr_setrobust
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libc.src.pthread.pthread_mutexattr_settype
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libc.src.pthread.pthread_once
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libc.src.pthread.pthread_rwlock_init
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libc.src.pthread.pthread_rwlock_tryrdlock
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libc.src.pthread.pthread_rwlock_rdlock
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libc.src.pthread.pthread_rwlock_timedrdlock
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libc.src.pthread.pthread_rwlock_trywrlock
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libc.src.pthread.pthread_rwlock_wrlock
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libc.src.pthread.pthread_rwlock_timedwrlock
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libc.src.pthread.pthread_rwlock_unlock
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libc.src.pthread.pthread_rwlock_destroy
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libc.src.pthread.pthread_rwlockattr_destroy
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libc.src.pthread.pthread_rwlockattr_getkind_np
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libc.src.pthread.pthread_rwlockattr_getpshared

‎libc/config/linux/api.td‎

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@@ -181,6 +181,7 @@ def PThreadAPI : PublicAPI<"pthread.h"> {
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"pthread_mutexattr_t",
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"pthread_once_t",
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"pthread_rwlockattr_t",
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"pthread_rwlock_t",
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"pthread_t",
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];
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}
@@ -270,6 +271,7 @@ def SysTypesAPI : PublicAPI<"sys/types.h"> {
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"pthread_mutexattr_t",
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"pthread_once_t",
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"pthread_rwlockattr_t",
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"pthread_rwlock_t",
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"pthread_t",
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"size_t",
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"ssize_t",

‎libc/config/linux/x86_64/entrypoints.txt‎

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@@ -726,6 +726,15 @@ if(LLVM_LIBC_FULL_BUILD)
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libc.src.pthread.pthread_mutexattr_setrobust
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libc.src.pthread.pthread_mutexattr_settype
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libc.src.pthread.pthread_once
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libc.src.pthread.pthread_rwlock_init
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libc.src.pthread.pthread_rwlock_tryrdlock
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libc.src.pthread.pthread_rwlock_rdlock
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libc.src.pthread.pthread_rwlock_timedrdlock
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libc.src.pthread.pthread_rwlock_trywrlock
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libc.src.pthread.pthread_rwlock_wrlock
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libc.src.pthread.pthread_rwlock_timedwrlock
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libc.src.pthread.pthread_rwlock_unlock
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libc.src.pthread.pthread_rwlock_destroy
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libc.src.pthread.pthread_rwlockattr_destroy
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libc.src.pthread.pthread_rwlockattr_getkind_np
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libc.src.pthread.pthread_rwlockattr_getpshared

‎libc/docs/configure.rst‎

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@@ -36,6 +36,7 @@ to learn about the defaults for your platform and target.
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- ``LIBC_CONF_PRINTF_FLOAT_TO_STR_USE_MEGA_LONG_DOUBLE_TABLE``: Use large table for better printf long double performance.
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* **"pthread" options**
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- ``LIBC_CONF_RAW_MUTEX_DEFAULT_SPIN_COUNT``: Default number of spins before blocking if a mutex is in contention (default to 100).
39+
- ``LIBC_CONF_RWLOCK_DEFAULT_SPIN_COUNT``: Default number of spins before blocking if a rwlock is in contention (default to 100).
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- ``LIBC_CONF_TIMEOUT_ENSURE_MONOTONICITY``: Automatically adjust timeout to CLOCK_MONOTONIC (default to true). POSIX API may require CLOCK_REALTIME, which can be unstable and leading to unexpected behavior. This option will convert the real-time timestamp to monotonic timestamp relative to the time of call.
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* **"string" options**
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- ``LIBC_CONF_MEMSET_X86_USE_SOFTWARE_PREFETCHING``: Inserts prefetch for write instructions (PREFETCHW) for memset on x86 to recover performance when hardware prefetcher is disabled.

‎libc/include/CMakeLists.txt‎

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@@ -332,6 +332,7 @@ add_gen_header(
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.llvm-libc-types.pthread_mutex_t
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.llvm-libc-types.pthread_mutexattr_t
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.llvm-libc-types.pthread_once_t
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.llvm-libc-types.pthread_rwlock_t
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.llvm-libc-types.pthread_rwlockattr_t
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.llvm-libc-types.pthread_t
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)

‎libc/include/llvm-libc-types/CMakeLists.txt‎

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@@ -54,6 +54,7 @@ add_header(pthread_key_t HDR pthread_key_t.h)
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add_header(pthread_mutex_t HDR pthread_mutex_t.h DEPENDS .__futex_word .__mutex_type)
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add_header(pthread_mutexattr_t HDR pthread_mutexattr_t.h)
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add_header(pthread_once_t HDR pthread_once_t.h DEPENDS .__futex_word)
57+
add_header(pthread_rwlock_t HDR pthread_rwlock_t.h DEPENDS .__futex_word .pid_t)
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add_header(pthread_rwlockattr_t HDR pthread_rwlockattr_t.h)
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add_header(pthread_t HDR pthread_t.h DEPENDS .__thread_type)
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add_header(rlim_t HDR rlim_t.h)

‎libc/include/llvm-libc-types/pthread_rwlock_t.h‎

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@@ -0,0 +1,26 @@
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//===-- Definition of pthread_mutex_t type --------------------------------===//
2+
//
3+
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4+
// See https://llvm.org/LICENSE.txt for license information.
5+
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6+
//
7+
//===----------------------------------------------------------------------===//
8+
9+
#ifndef LLVM_LIBC_TYPES_PTHREAD_RWLOCK_T_H
10+
#define LLVM_LIBC_TYPES_PTHREAD_RWLOCK_T_H
11+
12+
#include "llvm-libc-types/__futex_word.h"
13+
#include "llvm-libc-types/pid_t.h"
14+
typedef struct {
15+
unsigned __is_pshared : 1;
16+
unsigned __preference : 1;
17+
int __state;
18+
pid_t __writer_tid;
19+
__futex_word __wait_queue_mutex;
20+
__futex_word __pending_readers;
21+
__futex_word __pending_writers;
22+
__futex_word __reader_serialization;
23+
__futex_word __writer_serialization;
24+
} pthread_rwlock_t;
25+
26+
#endif // LLVM_LIBC_TYPES_PTHREAD_RWLOCK_T_H

‎libc/include/pthread.h.def‎

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@@ -17,6 +17,7 @@
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#define PTHREAD_STACK_MIN (1 << 14) // 16KB
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#define PTHREAD_MUTEX_INITIALIZER {0}
20+
#define PTHREAD_RWLOCK_INITIALIZER {}
2021
#define PTHREAD_ONCE_INIT {0}
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enum {

‎libc/spec/posix.td‎

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@@ -113,6 +113,8 @@ def POSIX : StandardSpec<"POSIX"> {
113113
NamedType PThreadRWLockAttrTType = NamedType<"pthread_rwlockattr_t">;
114114
PtrType PThreadRWLockAttrTPtr = PtrType<PThreadRWLockAttrTType>;
115115
ConstType ConstPThreadRWLockAttrTPtr = ConstType<PThreadRWLockAttrTPtr>;
116+
RestrictedPtrType RestrictedPThreadRWLockAttrTPtr = RestrictedPtrType<PThreadRWLockAttrTType>;
117+
ConstType ConstRestrictedPThreadRWLockAttrTPtr = ConstType<RestrictedPThreadRWLockAttrTPtr>;
116118

117119
NamedType PThreadMutexAttrTType = NamedType<"pthread_mutexattr_t">;
118120
PtrType PThreadMutexAttrTPtr = PtrType<PThreadMutexAttrTType>;
@@ -126,6 +128,10 @@ def POSIX : StandardSpec<"POSIX"> {
126128
ConstType ConstPThreadMutexTPtr = ConstType<PThreadMutexTPtr>;
127129
ConstType ConstRestrictedPThreadMutexTPtr = ConstType<RestrictedPThreadMutexTPtr>;
128130

131+
NamedType PThreadRWLockTType = NamedType<"pthread_rwlock_t">;
132+
PtrType PThreadRWLockTPtr = PtrType<PThreadRWLockTType>;
133+
RestrictedPtrType RestrictedPThreadRWLockTPtr = RestrictedPtrType<PThreadRWLockTType>;
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129135
PtrType PThreadTPtr = PtrType<PThreadTType>;
130136
RestrictedPtrType RestrictedPThreadTPtr = RestrictedPtrType<PThreadTType>;
131137

@@ -1003,6 +1009,7 @@ def POSIX : StandardSpec<"POSIX"> {
10031009
PThreadOnceCallback,
10041010
PThreadOnceT,
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PThreadRWLockAttrTType,
1012+
PThreadRWLockTType,
10061013
PThreadStartT,
10071014
PThreadTSSDtorT,
10081015
PThreadTType,
@@ -1259,6 +1266,51 @@ def POSIX : StandardSpec<"POSIX"> {
12591266
RetValSpec<IntType>,
12601267
[ArgSpec<PThreadRWLockAttrTPtr>, ArgSpec<IntType>]
12611268
>,
1269+
FunctionSpec<
1270+
"pthread_rwlock_init",
1271+
RetValSpec<IntType>,
1272+
[ArgSpec<PThreadRWLockTPtr>, ArgSpec<ConstRestrictedPThreadRWLockAttrTPtr>]
1273+
>,
1274+
FunctionSpec<
1275+
"pthread_rwlock_tryrdlock",
1276+
RetValSpec<IntType>,
1277+
[ArgSpec<PThreadRWLockTPtr>]
1278+
>,
1279+
FunctionSpec<
1280+
"pthread_rwlock_trywrlock",
1281+
RetValSpec<IntType>,
1282+
[ArgSpec<PThreadRWLockTPtr>]
1283+
>,
1284+
FunctionSpec<
1285+
"pthread_rwlock_timedrdlock",
1286+
RetValSpec<IntType>,
1287+
[ArgSpec<RestrictedPThreadRWLockTPtr>, ArgSpec<ConstRestrictStructTimeSpecPtr>]
1288+
>,
1289+
FunctionSpec<
1290+
"pthread_rwlock_timedwrlock",
1291+
RetValSpec<IntType>,
1292+
[ArgSpec<RestrictedPThreadRWLockTPtr>, ArgSpec<ConstRestrictStructTimeSpecPtr>]
1293+
>,
1294+
FunctionSpec<
1295+
"pthread_rwlock_rdlock",
1296+
RetValSpec<IntType>,
1297+
[ArgSpec<PThreadRWLockTPtr>]
1298+
>,
1299+
FunctionSpec<
1300+
"pthread_rwlock_wrlock",
1301+
RetValSpec<IntType>,
1302+
[ArgSpec<PThreadRWLockTPtr>]
1303+
>,
1304+
FunctionSpec<
1305+
"pthread_rwlock_unlock",
1306+
RetValSpec<IntType>,
1307+
[ArgSpec<PThreadRWLockTPtr>]
1308+
>,
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FunctionSpec<
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"pthread_rwlock_destroy",
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RetValSpec<IntType>,
1312+
[ArgSpec<PThreadRWLockTPtr>]
1313+
>,
12621314
]
12631315
>;
12641316

@@ -1616,6 +1668,7 @@ def POSIX : StandardSpec<"POSIX"> {
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PThreadMutexTType,
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PThreadOnceT,
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PThreadRWLockAttrTType,
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PThreadRWLockTType,
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PThreadTType,
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PidT,
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SSizeTType,

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