1 /* This is a test case where the parent process forks 10 children
2 * which contend to merge profile data to the same file. With
3 * file locking support, the data from each child should not
4 * be lost.
5 */
6 #include <stdio.h>
7 #include <stdlib.h>
8 #include <windows.h>
9
spawn_child(PROCESS_INFORMATION * pi,int child_num)10 void spawn_child(PROCESS_INFORMATION *pi, int child_num) {
11 wchar_t child_str[10];
12 _itow(child_num, child_str, 10);
13 if (!SetEnvironmentVariableW(L"CHILD_NUM", child_str)) {
14 printf("SetEnvironmentVariableW failed (0x%8lx).\n", GetLastError());
15 fflush(stdout);
16 exit(1);
17 }
18
19 STARTUPINFOW si;
20 memset(&si, 0, sizeof(si));
21 si.cb = sizeof(si);
22
23 memset(pi, 0, sizeof(PROCESS_INFORMATION));
24
25 if (!CreateProcessW(NULL, // No module name (use command line)
26 GetCommandLineW(), // Command line
27 NULL, // Process handle not inheritable
28 NULL, // Thread handle not inheritable
29 TRUE, // Set handle inheritance to TRUE
30 0, // No flags
31 NULL, // Use parent's environment block
32 NULL, // Use parent's starting directory
33 &si, pi)) {
34 printf("CreateProcess failed (0x%08lx).\n", GetLastError());
35 fflush(stdout);
36 exit(1);
37 }
38 }
39
wait_child(PROCESS_INFORMATION * pi)40 int wait_child(PROCESS_INFORMATION *pi) {
41 WaitForSingleObject(pi->hProcess, INFINITE);
42
43 DWORD exit_code;
44 if (!GetExitCodeProcess(pi->hProcess, &exit_code)) {
45 printf("GetExitCodeProcess failed (0x%08lx).\n", GetLastError());
46 fflush(stdout);
47 exit(1);
48 }
49
50 CloseHandle(pi->hProcess);
51 CloseHandle(pi->hThread);
52
53 return exit_code;
54 }
55
56 #define NUM_CHILDREN 10
57
foo(int num)58 int foo(int num) {
59 if (num < (NUM_CHILDREN / 2)) {
60 return 1;
61 } else if (num < NUM_CHILDREN) {
62 return 2;
63 }
64 return 3;
65 }
66
main(int argc,char * argv[])67 int main(int argc, char *argv[]) {
68 char *child_str = getenv("CHILD_NUM");
69 if (!child_str) {
70 PROCESS_INFORMATION child[NUM_CHILDREN];
71 // In parent
72 for (int i = 0; i < NUM_CHILDREN; i++) {
73 spawn_child(&child[i], i);
74 }
75 for (int i = 0; i < NUM_CHILDREN; i++) {
76 wait_child(&child[i]);
77 }
78 return 0;
79 } else {
80 // In child
81 int child_num = atoi(child_str);
82 int result = foo(child_num);
83 if (result == 3) {
84 fprintf(stderr, "Invalid child count!");
85 return 1;
86 }
87 return 0;
88 }
89 }
90