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Formerly job.c.~65~

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This commit is contained in:
Roland McGrath 1992-05-09 02:26:35 +00:00
parent 569cdeac4e
commit d9dedc8f27
1 changed files with 51 additions and 9 deletions
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60
job.c
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@ -176,7 +176,7 @@ child_error (target_name, exit_code, exit_sig, coredump, ignored)
}
}
int child_died = 0;
static unsigned int dead_children = 0;
/* Notice that a child died.
reap_children should be called when convenient. */
@ -184,7 +184,11 @@ int
child_handler (sig)
int sig;
{
child_died = 1;
++dead_children;
if (debug_flag)
printf ("Got a SIGCHLD; %d unreaped children.\n", dead_children);
return 0;
}
@ -203,7 +207,7 @@ reap_children (block, err)
WAIT_T status;
while ((children != 0 || shell_function_pid != 0) &&
(block || child_died))
(block || dead_children > 0))
{
int remote = 0;
register int pid;
@ -211,14 +215,33 @@ reap_children (block, err)
register struct child *lastc, *c;
int child_failed;
if (err && !child_died)
if (err && dead_children == 0)
{
/* We might block for a while, so let the user know why. */
fflush (stdout);
error ("*** Waiting for unfinished jobs....");
}
child_died = 0;
/* We have one less dead child to reap.
The test and decrement are not atomic; if it is compiled into:
register = dead_children - 1;
dead_children = register;
a SIGCHLD could come between the two instructions.
child_handler increments dead_children.
The second instruction here would lose that increment. But the
only effect of dead_children being wrong is that we might wait
longer than necessary to reap a child, and lose some parallelism;
and we might print the "Waiting for unfinished jobs" message above
when not necessary. */
if (dead_children != 0)
--dead_children;
if (debug_flag)
for (c = children; c != 0; c = c->next)
printf ("Live child 0x%08lx PID %d%s\n",
(unsigned long int) c,
c->pid, c->remote ? " (remote)" : "");
/* First, check for remote children. */
pid = remote_status (&exit_code, &exit_sig, &coredump, 0);
@ -232,9 +255,10 @@ reap_children (block, err)
else
#endif
pid = wait (&status);
fprintf (stderr,"%sblocking wait returned %d\n", block?"":"non",pid);
if (pid <= 0)
if (pid < 0)
pfatal_with_name ("wait");
else if (pid == 0)
/* No local children. */
break;
else
@ -281,6 +305,12 @@ reap_children (block, err)
}
else
{
if (debug_flag)
printf ("Reaping %s child 0x%08lx PID %d%s\n",
child_failed ? "losing" : "winning",
(unsigned long int) c,
c->pid, c->remote ? " (remote)" : "");
/* If this child had the good stdin, say it is now free. */
if (c->good_stdin)
good_stdin_used = 0;
@ -307,6 +337,8 @@ reap_children (block, err)
if (!err)
/* If there are more commands to run, try to start them. */
start_job (c);
else
c->file->command_state = cs_finished;
switch (c->file->command_state)
{
@ -334,6 +366,11 @@ reap_children (block, err)
/* Notice if the target of the commands has been changed. */
notice_finished_file (c->file);
if (debug_flag)
printf ("Removing child 0x%08lx PID %d%s from chain.\n",
(unsigned long int) c,
c->pid, c->remote ? " (remote)" : "");
/* Remove the child from the chain and free it. */
if (lastc == 0)
children = c->next;
@ -344,8 +381,9 @@ reap_children (block, err)
/* There is now another slot open. */
--job_slots_used;
/* If the job failed, and the -k flag was not given, die. */
if (child_failed && !keep_going_flag)
/* If the job failed, and the -k flag was not given, die,
unless we are already in the process of dying. */
if (!err && child_failed && !keep_going_flag)
die (1);
}
@ -645,6 +683,10 @@ new_job (file)
{
case cs_running:
c->next = children;
if (debug_flag)
printf ("Putting child 0x%08lx PID %d%s on the chain.\n",
(unsigned long int) c,
c->pid, c->remote ? " (remote)" : "");
children = c;
/* One more job slot is in use. */
++job_slots_used;