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fix read and poll

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This commit is contained in:
Søren Sandmann Pedersen
2004-06-17 19:32:03 +00:00
parent 33372e3479
commit 5e2c688d8d
1 changed files with 6 additions and 6 deletions
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12
sysprof-module.c
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@ -20,7 +20,7 @@
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");
MODULE_AUTHOR("Soeren Sandmann (sandmann@daimi.au.dk)"); MODULE_AUTHOR("Soeren Sandmann (sandmann@daimi.au.dk)");
#define SAMPLES_PER_SECOND (50) #define SAMPLES_PER_SECOND (20)
#define INTERVAL (HZ / SAMPLES_PER_SECOND) #define INTERVAL (HZ / SAMPLES_PER_SECOND)
#define N_TRACES 256 #define N_TRACES 256
@ -187,16 +187,13 @@ procfile_read(char *buffer,
int *eof, int *eof,
void *data) void *data)
{ {
wait_event_interruptible(wait_for_trace, head != tail);
if (buffer_len < sizeof (SysprofStackTrace)) if (buffer_len < sizeof (SysprofStackTrace))
return -ENOMEM; return -ENOMEM;
memcpy (buffer, (char *)tail, sizeof (SysprofStackTrace)); wait_event_interruptible (wait_for_trace, head != tail);
*buffer_location = (char *)tail;
if (tail++ == &stack_traces[N_TRACES - 1]) if (tail++ == &stack_traces[N_TRACES - 1])
tail = &stack_traces[0]; tail = &stack_traces[0];
*buffer_location = buffer;
return sizeof (SysprofStackTrace); return sizeof (SysprofStackTrace);
} }
@ -204,6 +201,9 @@ struct proc_dir_entry *trace_proc_file;
static unsigned int static unsigned int
procfile_poll(struct file *filp, poll_table *poll_table) procfile_poll(struct file *filp, poll_table *poll_table)
{ {
if (head != tail) {
return POLLIN | POLLRDNORM;
}
poll_wait(filp, &wait_for_trace, poll_table); poll_wait(filp, &wait_for_trace, poll_table);
if (head != tail) { if (head != tail) {
return POLLIN | POLLRDNORM; return POLLIN | POLLRDNORM;