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sigalarm

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This commit is contained in:
Robert Morris 2019-08-02 13:18:26 -04:00
parent 0c10cbe829
commit 9110f40b7d
1 changed files with 7 additions and 6 deletions
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13
labs/syscall.html
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@ -143,12 +143,12 @@ void test0()
{
int i;
printf(1, "test0 start\n");
alarm(2, periodic);
sigalarm(2, periodic);
for(i = 0; i < 1000*500000; i++){
if((i % 250000) == 0)
write(2, ".", 1);
}
alarm(0, 0);
sigalarm(0, 0);
printf(1, "test0 done\n");
}
@ -171,7 +171,7 @@ void test1() {
printf(1, "test1 start\n");
j = 0;
alarm(2, periodic);
sigalarm(2, periodic);
for(i = 0; i < 1000*500000; i++){
foo(i, &j);
}
@ -237,13 +237,14 @@ alarmtest starting
<li>You'll need to modify the Makefile to cause <tt>alarmtest.c</tt>
to be compiled as an xv6 user program.
<li>The right declaration to put in <tt>user/user.h</tt> is:
<li>The right declarations to put in <tt>user/user.h</tt> is:
<pre>
int sigalarm(int ticks, void (*handler)());
</pre>
<li>Update kernel/syscall.h and user/usys.S (update usys.pl to update
usys.S) to allow <tt>alarmtest</tt> to invoke the sigalarm system
<li>Update user/sys.pl (which generates user/usys.S),
kernel/syscall.h, and kernel/syscall.c
to allow <tt>alarmtest</tt> to invoke the sigalarm system
call.
<li>Your <tt>sys_sigalarm()</tt> should store the alarm interval and