github.com/ccccaoqing/test@v0.0.0-20220510085219-3985d23445c0/test/bench/shootout/threadring.c (about)

     1  /*
     2  Redistribution and use in source and binary forms, with or without
     3  modification, are permitted provided that the following conditions are met:
     4  
     5      * Redistributions of source code must retain the above copyright
     6      notice, this list of conditions and the following disclaimer.
     7  
     8      * Redistributions in binary form must reproduce the above copyright
     9      notice, this list of conditions and the following disclaimer in the
    10      documentation and/or other materials provided with the distribution.
    11  
    12      * Neither the name of "The Computer Language Benchmarks Game" nor the
    13      name of "The Computer Language Shootout Benchmarks" nor the names of
    14      its contributors may be used to endorse or promote products derived
    15      from this software without specific prior written permission.
    16  
    17  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    18  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    19  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    20  ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
    21  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    22  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    23  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    24  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    25  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    26  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    27  POSSIBILITY OF SUCH DAMAGE.
    28  */
    29  
    30  /*
    31  * The Computer Language Benchmarks Game
    32  * http://shootout.alioth.debian.org/
    33  
    34  * contributed by Premysl Hruby
    35  */
    36  
    37  #include <stdint.h>
    38  #include <stdio.h>
    39  #include <stdlib.h>
    40  #include <pthread.h>
    41  #include <string.h>
    42  #include <limits.h>
    43  
    44  // PTHREAD_STACK_MIN undeclared on mingw
    45  #ifndef PTHREAD_STACK_MIN
    46  #define PTHREAD_STACK_MIN 65535
    47  #endif
    48  
    49  #define THREADS (503)
    50  
    51  struct stack {
    52     char x[PTHREAD_STACK_MIN];
    53  };
    54  
    55  
    56  /* staticaly initialize mutex[0] mutex */
    57  static pthread_mutex_t mutex[THREADS];
    58  static int data[THREADS];
    59  static struct stack stacks[THREADS];
    60  /* stacks must be defined staticaly, or my i386 box run of virtual memory for this
    61   * process while creating thread +- #400 */
    62  
    63  static void* thread(void *num)
    64  {
    65     int l = (int)(uintptr_t)num;
    66     int r = (l+1) % THREADS;
    67     int token;
    68  
    69     while(1) {
    70        pthread_mutex_lock(mutex + l);
    71        token = data[l];
    72        if (token) {
    73           data[r] = token - 1;
    74           pthread_mutex_unlock(mutex + r);
    75        }
    76        else {
    77           printf("%i\n", l+1);
    78           exit(0);
    79        }
    80     }
    81  }
    82  
    83  
    84  
    85  int main(int argc, char **argv)
    86  {
    87     int i;
    88     pthread_t cthread;
    89     pthread_attr_t stack_attr;
    90  
    91     if (argc != 2)
    92        exit(255);
    93     data[0] = atoi(argv[1]);
    94  
    95     pthread_attr_init(&stack_attr);
    96  
    97     for (i = 0; i < THREADS; i++) {
    98        pthread_mutex_init(mutex + i, NULL);
    99        pthread_mutex_lock(mutex + i);
   100  
   101  #if defined(__MINGW32__) || defined(__MINGW64__)
   102        pthread_attr_setstackaddr(&stack_attr, &stacks[i]);
   103        pthread_attr_setstacksize(&stack_attr, sizeof(struct stack));
   104  #else
   105        pthread_attr_setstack(&stack_attr, &stacks[i], sizeof(struct stack));
   106  #endif
   107  
   108        pthread_create(&cthread, &stack_attr, thread, (void*)(uintptr_t)i);
   109     }
   110  
   111     pthread_mutex_unlock(mutex + 0);
   112     pthread_join(cthread, NULL);
   113  }