File: instrprof-gcov-parallel.driver.c

package info (click to toggle)
swiftlang 6.1.3-1
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid
  • size: 2,791,532 kB
  • sloc: cpp: 9,901,743; ansic: 2,201,431; asm: 1,091,827; python: 308,252; objc: 82,166; f90: 80,126; lisp: 38,358; pascal: 25,559; sh: 20,429; ml: 5,058; perl: 4,745; makefile: 4,484; awk: 3,535; javascript: 3,018; xml: 918; fortran: 664; cs: 573; ruby: 396
file content (36 lines) | stat: -rw-r--r-- 837 bytes parent folder | download | duplicates (30) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
 
#include <stdatomic.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

#define CHILDREN 7

int main(int argc, char *argv[]) {
  _Atomic int *sync = mmap(NULL, sizeof(int), PROT_READ | PROT_WRITE,
                           MAP_SHARED | MAP_ANONYMOUS, -1, 0);
  if (sync == MAP_FAILED)
    return 1;
  *sync = 0;

  for (int i = 0; i < CHILDREN; i++) {
    pid_t pid = fork();
    if (!pid) {
      // child
      while (*sync == 0)
        ; // wait the parent in order to call execl simultaneously
      execl(argv[1], argv[1], NULL);
    } else if (pid == -1) {
      *sync = 1; // release all children
      return 1;
    }
  }

  // parent
  *sync = 1; // start the program in all children simultaneously
  for (int i = 0; i < CHILDREN; i++)
    wait(NULL);

  return 0;
}