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two exit/exit tests

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This commit is contained in:
Robert Morris 2019-07-05 11:44:51 -04:00
parent fab5e7c1de
commit be88befed7
1 changed files with 76 additions and 2 deletions
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78
user/usertests.c
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@ -417,16 +417,18 @@ exitwait(void)
{
int i, pid;
printf(1, "exitwait test\n");
for(i = 0; i < 100; i++){
pid = fork();
if(pid < 0){
printf(1, "fork failed\n");
return;
exit();
}
if(pid){
if(wait() != pid){
printf(1, "wait wrong pid\n");
return;
exit();
}
} else {
exit();
@ -435,6 +437,75 @@ exitwait(void)
printf(1, "exitwait ok\n");
}
// try to find races in the reparenting
// code that handles a parent exiting
// when it still has live children.
void
reparent(void)
{
int master_pid = getpid();
printf(1, "reparent test\n");
for(int i = 0; i < 100; i++){
int pid = fork();
if(pid < 0){
printf(1, "fork failed\n");
exit();
}
if(pid){
if(wait() != pid){
printf(1, "wait wrong pid\n");
exit();
}
} else {
int pid2 = fork();
if(pid2 < 0){
printf(1, "fork failed\n");
kill(master_pid);
exit();
}
if(pid2 == 0){
exit();
} else {
exit();
}
}
}
printf(1, "reparent ok\n");
}
// what if two children exit() at the same time?
void
twochildren(void)
{
printf(1, "twochildren test\n");
for(int i = 0; i < 1000; i++){
int pid1 = fork();
if(pid1 < 0){
printf(1, "fork failed\n");
exit();
}
if(pid1 == 0){
exit();
} else {
int pid2 = fork();
if(pid2 < 0){
printf(1, "fork failed\n");
exit();
}
if(pid2 == 0){
exit();
} else {
wait();
wait();
}
}
}
printf(1, "twochildren ok\n");
}
void
mem(void)
{
@ -1751,6 +1822,9 @@ main(int argc, char *argv[])
}
close(open("usertests.ran", O_CREATE));
reparent();
twochildren();
argptest();
createdelete();
linkunlink();