clang/test/linuxrwlocks_unannotated.c

   1 #include <stdio.h>
   2 #include <threads.h>
   3 #include <stdatomic.h>
   4
   5 #include "libinterface.h"
   6
   7 #define RW_LOCK_BIAS            0x00100000
   8 #define WRITE_LOCK_CMP          RW_LOCK_BIAS
   9
  10 /** Example implementation of linux rw lock along with 2 thread test
  11  *  driver... */
  12
  13 typedef union {
  14         int lock;
  15 } rwlock_t;
  16
  17 static inline void read_lock(rwlock_t *rw)
  18 {
  19         int priorvalue=rmw_32(ADD, &rw->lock, /* dummy */ 0, ((unsigned int)-1));
  20
  21         while (true) {
  22                 if (priorvalue <= 0) {
  23                 } else {
  24                         break;
  25                 }
  26
  27                 rmw_32(ADD, &rw->lock, /* dummy */ 0, 1);
  28
  29                 while (true) {
  30                         int status = load_32(&rw->lock);
  31                         if (status > 0) {
  32                         } else {
  33                                 break;
  34                         }
  35                         MC2_yield();
  36                 }
  37
  38                 priorvalue=rmw_32(ADD, &rw->lock, /* dummy */ 0, ((unsigned int)-1));
  39                 MC2_loopIterate();
  40         }
  41 }
  42
  43 static inline void write_lock(rwlock_t *rw)
  44 {
  45         int priorvalue=rmw_32(ADD, &rw->lock, /* dummy */ 0, ((unsigned int)-(RW_LOCK_BIAS)));
  46         while(true) {
  47
  48                 if (priorvalue != RW_LOCK_BIAS) {
  49                 } else {
  50                         break;
  51                 }
  52
  53                 rmw_32(ADD, &rw->lock, /* dummy */ 0, RW_LOCK_BIAS);
  54
  55                 while (true) {
  56                         int status = load_32(&rw->lock);
  57                         if (status != RW_LOCK_BIAS) {
  58                         } else {
  59                                 break;
  60                         }
  61                         MC2_yield();
  62                 }
  63
  64                 priorvalue=rmw_32(ADD, &rw->lock, /* dummy */ 0, ((unsigned int)-(RW_LOCK_BIAS)));
  65         }
  66 }
  67
  68 static inline bool write_trylock(rwlock_t *rw)
  69 {
  70         int priorvalue=rmw_32(ADD, &rw->lock, /* dummy */ 0, ((unsigned int)-(RW_LOCK_BIAS)));
  71
  72         int flag = priorvalue != RW_LOCK_BIAS;
  73         if (flag) {
  74         } else {
  75                 rmw_32(ADD, &rw->lock, /* dummy */ 0, RW_LOCK_BIAS);
  76         }
  77
  78         return flag;
  79 }
  80
  81 static inline void read_unlock(rwlock_t *rw)
  82 {
  83         rmw_32(ADD, &rw->lock, /* dummy */ 0, 1);
  84 }
  85
  86 static inline void write_unlock(rwlock_t *rw)
  87 {
  88         rmw_32(ADD, &rw->lock, /* dummy */ 0, RW_LOCK_BIAS);
  89 }
  90
  91 rwlock_t mylock;
  92 int shareddata;
  93
  94 static void foo() {
  95         int flag=write_trylock(&mylock);
  96         if (flag) {
  97                 write_unlock(&mylock);
  98         }
  99 }
 100
 101 static void a(void *obj)
 102 {
 103         int i;
 104         for(i=0;i<13;i++)
 105                 foo();
 106 }
 107
 108 int user_main(int argc, char **argv)
 109 {
 110         thrd_t t1, t2;
 111         //, t3, t4;
 112         store_32(&mylock.lock, RW_LOCK_BIAS);
 113
 114         thrd_create(&t1, (thrd_start_t)&a, NULL);
 115         thrd_create(&t2, (thrd_start_t)&a, NULL);
 116         //      thrd_create(&t3, (thrd_start_t)&a, NULL);
 117         //      thrd_create(&t4, (thrd_start_t)&a, NULL);
 118
 119         thrd_join(t1);
 120         thrd_join(t2);
 121         //      thrd_join(t3);
 122         //      thrd_join(t4);
 123
 124         return 0;
 125 }