| 1 | #include <lightning.h> |
| 2 | #include <pthread.h> |
| 3 | #include <stdio.h> |
| 4 | #include <unistd.h> |
| 5 | #include <signal.h> |
| 6 | |
| 7 | #if DEBUG |
| 8 | volatile |
| 9 | #endif |
| 10 | jit_word_t lock; |
| 11 | pthread_t tids[4]; |
| 12 | |
| 13 | #if DEBUG |
| 14 | int debug_offset(void) |
| 15 | { |
| 16 | int i; |
| 17 | pthread_t self = pthread_self(); |
| 18 | for (i = 0; i < 4; ++i) |
| 19 | if (tids[i] == self) |
| 20 | return i; |
| 21 | return -1; |
| 22 | } |
| 23 | |
| 24 | void debug_spin(void) |
| 25 | { |
| 26 | printf(" spin %d : %ld\n", debug_offset(), lock); |
| 27 | } |
| 28 | |
| 29 | void debug_lock(void) |
| 30 | { |
| 31 | printf(" lock %d : %ld\n", debug_offset(), lock); |
| 32 | } |
| 33 | |
| 34 | void debug_unlock(void) |
| 35 | { |
| 36 | printf("unlock %d : %ld\n", debug_offset(), lock); |
| 37 | } |
| 38 | #define DEBUG_SPIN() jit_calli(debug_spin) |
| 39 | #define DEBUG_LOCK() jit_calli(debug_lock) |
| 40 | #define DEBUG_UNLOCK() jit_calli(debug_unlock) |
| 41 | #else |
| 42 | #define DEBUG_SPIN() /**/ |
| 43 | #define DEBUG_LOCK() /**/ |
| 44 | #define DEBUG_UNLOCK() /**/ |
| 45 | #endif |
| 46 | |
| 47 | void alarm_handler(int unused) |
| 48 | { |
| 49 | _exit(1); |
| 50 | } |
| 51 | |
| 52 | int |
| 53 | main(int argc, char *argv[]) |
| 54 | { |
| 55 | jit_state_t *_jit; |
| 56 | void (*code)(void); |
| 57 | jit_node_t *jmpi_main, *label; |
| 58 | jit_node_t *func0, *func1, *func2, *func3; |
| 59 | jit_node_t *patch0, *patch1, *patch2, *patch3; |
| 60 | |
| 61 | /* If there is any bug, do not hang in "make check" */ |
| 62 | signal(SIGALRM, alarm_handler); |
| 63 | alarm(5); |
| 64 | |
| 65 | init_jit(argv[0]); |
| 66 | _jit = jit_new_state(); |
| 67 | |
| 68 | jmpi_main = jit_jmpi(); |
| 69 | |
| 70 | #define defun(name, line) \ |
| 71 | jit_name(#name); \ |
| 72 | jit_note("catomic.c", line); \ |
| 73 | name = jit_label(); \ |
| 74 | jit_prolog(); \ |
| 75 | jit_movi(JIT_V0, (jit_word_t)&lock); \ |
| 76 | jit_movi(JIT_V1, 0); \ |
| 77 | jit_movi(JIT_V2, line); \ |
| 78 | /* spin until get the lock */ \ |
| 79 | DEBUG_SPIN(); \ |
| 80 | label = jit_label(); \ |
| 81 | jit_casr(JIT_R0, JIT_V0, JIT_V1, JIT_V2); \ |
| 82 | jit_patch_at(jit_beqi(JIT_R0, 0), label); \ |
| 83 | /* lock acquired */ \ |
| 84 | DEBUG_LOCK(); \ |
| 85 | jit_prepare(); \ |
| 86 | /* pretend to be doing something useful for 0.01 sec |
| 87 | * while holding the lock */ \ |
| 88 | jit_pushargi(10000); \ |
| 89 | jit_finishi(usleep); \ |
| 90 | /* release lock */ \ |
| 91 | DEBUG_UNLOCK(); \ |
| 92 | jit_movi(JIT_V1, 0); \ |
| 93 | jit_str(JIT_V0, JIT_V1); \ |
| 94 | /* Now test casi */ \ |
| 95 | jit_movi(JIT_V1, 0); \ |
| 96 | jit_movi(JIT_V2, line); \ |
| 97 | /* spin until get the lock */ \ |
| 98 | DEBUG_SPIN(); \ |
| 99 | label = jit_label(); \ |
| 100 | jit_casi(JIT_R0, (jit_word_t)&lock, JIT_V1, JIT_V2); \ |
| 101 | jit_patch_at(jit_beqi(JIT_R0, 0), label); \ |
| 102 | /* lock acquired */ \ |
| 103 | DEBUG_LOCK(); \ |
| 104 | jit_prepare(); \ |
| 105 | /* pretend to be doing something useful for 0.01 sec |
| 106 | * while holding the lock */ \ |
| 107 | jit_pushargi(10000); \ |
| 108 | jit_finishi(usleep); \ |
| 109 | jit_prepare(); \ |
| 110 | /* for make check, just print "ok" */ \ |
| 111 | jit_pushargi((jit_word_t)"ok"); \ |
| 112 | /*jit_pushargi((jit_word_t)#name);*/ \ |
| 113 | jit_finishi(puts); \ |
| 114 | /* release lock */ \ |
| 115 | DEBUG_UNLOCK(); \ |
| 116 | jit_movi(JIT_V1, 0); \ |
| 117 | jit_str(JIT_V0, JIT_V1); \ |
| 118 | jit_ret(); \ |
| 119 | jit_epilog(); |
| 120 | defun(func0, __LINE__); |
| 121 | defun(func1, __LINE__); |
| 122 | defun(func2, __LINE__); |
| 123 | defun(func3, __LINE__); |
| 124 | |
| 125 | jit_patch(jmpi_main); |
| 126 | jit_name("main"); |
| 127 | jit_note("catomic.c", __LINE__); |
| 128 | jit_prolog(); |
| 129 | |
| 130 | #define start(tid) \ |
| 131 | /* set JIT_R0 to thread function */ \ |
| 132 | jit_patch_at(jit_movi(JIT_R0, 0), func##tid); \ |
| 133 | jit_prepare(); \ |
| 134 | /* pthread_t first argument */ \ |
| 135 | jit_pushargi((jit_word_t)(tids + tid)); \ |
| 136 | /* pthread_attr_t second argument */ \ |
| 137 | jit_pushargi((jit_word_t)NULL); \ |
| 138 | /* start routine third argument */ \ |
| 139 | jit_pushargr(JIT_R0); \ |
| 140 | /* argument to start routine fourth argument */ \ |
| 141 | jit_pushargi((jit_word_t)NULL); \ |
| 142 | /* start thread */ \ |
| 143 | jit_finishi(pthread_create); |
| 144 | /* spawn four threads */ |
| 145 | start(0); |
| 146 | start(1); |
| 147 | start(2); |
| 148 | start(3); |
| 149 | |
| 150 | #define join(tid) \ |
| 151 | /* load pthread_t value in JIT_R0 */ \ |
| 152 | jit_movi(JIT_R0, (jit_word_t)tids); \ |
| 153 | jit_ldxi(JIT_R0, JIT_R0, tid * sizeof(pthread_t)); \ |
| 154 | jit_prepare(); \ |
| 155 | jit_pushargr(JIT_R0); \ |
| 156 | jit_pushargi((jit_word_t)NULL); \ |
| 157 | jit_finishi(pthread_join); |
| 158 | /* wait for threads to finish */ |
| 159 | join(0); |
| 160 | join(1); |
| 161 | join(2); |
| 162 | join(3); |
| 163 | |
| 164 | jit_prepare(); |
| 165 | jit_pushargi((jit_word_t)"ok"); |
| 166 | jit_finishi(puts); |
| 167 | |
| 168 | jit_ret(); |
| 169 | jit_epilog(); |
| 170 | |
| 171 | code = jit_emit(); |
| 172 | |
| 173 | #if DEBUG |
| 174 | jit_disassemble(); |
| 175 | #endif |
| 176 | |
| 177 | jit_clear_state(); |
| 178 | |
| 179 | /* let first thread acquire the lock */ |
| 180 | lock = 0; |
| 181 | |
| 182 | (*code)(); |
| 183 | jit_destroy_state(); |
| 184 | |
| 185 | finish_jit(); |
| 186 | |
| 187 | return (0); |
| 188 | } |