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      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 }
    114