atomics.c (3591B)
1 /* 2 * Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #include <stdlib.h> 19 #include <stdio.h> 20 #include <string.h> 21 #include <unistd.h> 22 #include <inttypes.h> 23 #include <pthread.h> 24 25 /* Using volatile because we are testing atomics */ 26 static inline int atomic_inc32(volatile int *x) 27 { 28 int old, dummy; 29 __asm__ __volatile__( 30 "1: %0 = memw_locked(%2)\n\t" 31 " %1 = add(%0, #1)\n\t" 32 " memw_locked(%2, p0) = %1\n\t" 33 " if (!p0) jump 1b\n\t" 34 : "=&r"(old), "=&r"(dummy) 35 : "r"(x) 36 : "p0", "memory"); 37 return old; 38 } 39 40 /* Using volatile because we are testing atomics */ 41 static inline long long atomic_inc64(volatile long long *x) 42 { 43 long long old, dummy; 44 __asm__ __volatile__( 45 "1: %0 = memd_locked(%2)\n\t" 46 " %1 = #1\n\t" 47 " %1 = add(%0, %1)\n\t" 48 " memd_locked(%2, p0) = %1\n\t" 49 " if (!p0) jump 1b\n\t" 50 : "=&r"(old), "=&r"(dummy) 51 : "r"(x) 52 : "p0", "memory"); 53 return old; 54 } 55 56 /* Using volatile because we are testing atomics */ 57 static inline int atomic_dec32(volatile int *x) 58 { 59 int old, dummy; 60 __asm__ __volatile__( 61 "1: %0 = memw_locked(%2)\n\t" 62 " %1 = add(%0, #-1)\n\t" 63 " memw_locked(%2, p0) = %1\n\t" 64 " if (!p0) jump 1b\n\t" 65 : "=&r"(old), "=&r"(dummy) 66 : "r"(x) 67 : "p0", "memory"); 68 return old; 69 } 70 71 /* Using volatile because we are testing atomics */ 72 static inline long long atomic_dec64(volatile long long *x) 73 { 74 long long old, dummy; 75 __asm__ __volatile__( 76 "1: %0 = memd_locked(%2)\n\t" 77 " %1 = #-1\n\t" 78 " %1 = add(%0, %1)\n\t" 79 " memd_locked(%2, p0) = %1\n\t" 80 " if (!p0) jump 1b\n\t" 81 : "=&r"(old), "=&r"(dummy) 82 : "r"(x) 83 : "p0", "memory"); 84 return old; 85 } 86 87 #define LOOP_CNT 1000 88 /* Using volatile because we are testing atomics */ 89 volatile int tick32 = 1; 90 /* Using volatile because we are testing atomics */ 91 volatile long long tick64 = 1; 92 int err; 93 94 void *thread1_func(void *arg) 95 { 96 int i; 97 98 for (i = 0; i < LOOP_CNT; i++) { 99 atomic_inc32(&tick32); 100 atomic_dec64(&tick64); 101 } 102 return NULL; 103 } 104 105 void *thread2_func(void *arg) 106 { 107 int i; 108 for (i = 0; i < LOOP_CNT; i++) { 109 atomic_dec32(&tick32); 110 atomic_inc64(&tick64); 111 } 112 return NULL; 113 } 114 115 void test_pthread(void) 116 { 117 pthread_t tid1, tid2; 118 119 pthread_create(&tid1, NULL, thread1_func, "hello1"); 120 pthread_create(&tid2, NULL, thread2_func, "hello2"); 121 pthread_join(tid1, NULL); 122 pthread_join(tid2, NULL); 123 124 if (tick32 != 1) { 125 printf("ERROR: tick32 %d != 1\n", tick32); 126 err++; 127 } 128 if (tick64 != 1) { 129 printf("ERROR: tick64 %lld != 1\n", tick64); 130 err++; 131 } 132 } 133 134 int main(int argc, char **argv) 135 { 136 test_pthread(); 137 puts(err ? "FAIL" : "PASS"); 138 return err; 139 }