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Remove left over debug print out and add support for multiple clients

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2005-12-20  Kristian Høgsberg  <krh@redhat.com>

        * module/sysprof-module.c: Remove left over debug print out and
        add support for multiple clients (readers).
This commit is contained in:
Kristian Høgsberg
2005-12-20 22:45:34 +00:00
committed by Kristian Høgsberg
parent acc0ee9ec9
commit 3c8bde00b4
2 changed files with 20 additions and 9 deletions
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4
ChangeLog
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@ -1,7 +1,7 @@
2005-12-20 Kristian Høgsberg <krh@redhat.com>
* module/sysprof-module.c (sysprof_read): Remove left over debug
print out.
* module/sysprof-module.c: Remove left over debug print out and
add support for multiple clients (readers).
Tue Dec 20 16:03:29 2005 Soeren Sandmann <sandmann@redhat.com>

25
module/sysprof-module.c
View File

@ -51,9 +51,9 @@ MODULE_AUTHOR("Soeren Sandmann (sandmann@daimi.au.dk)");
static SysprofStackTrace stack_traces[N_TRACES];
static SysprofStackTrace * head = &stack_traces[0];
static SysprofStackTrace * tail = &stack_traces[0];
static atomic_t client_count = ATOMIC_INIT(0);
DECLARE_WAIT_QUEUE_HEAD (wait_for_trace);
DECLARE_WAIT_QUEUE_HEAD (wait_for_exit);
/* Macro the names of the registers that are used on each architecture */
#if defined(CONFIG_X86_64)
@ -170,6 +170,7 @@ static int
sysprof_read(struct file *file, char *buffer, size_t count, loff_t *offset)
{
SysprofStackTrace *trace;
SysprofStackTrace *tail = file->private_data;
if (count < sizeof *tail)
return -EMSGSIZE;
@ -184,16 +185,20 @@ sysprof_read(struct file *file, char *buffer, size_t count, loff_t *offset)
if (copy_to_user(buffer, tail, sizeof *tail))
return -EFAULT;
file->private_data = tail;
return sizeof *tail;
}
static unsigned int
sysprof_poll(struct file *filp, poll_table *poll_table)
sysprof_poll(struct file *file, poll_table *poll_table)
{
SysprofStackTrace *tail = file->private_data;
if (head != tail)
return POLLIN | POLLRDNORM;
poll_wait(filp, &wait_for_trace, poll_table);
poll_wait(file, &wait_for_trace, poll_table);
if (head != tail)
return POLLIN | POLLRDNORM;
@ -204,15 +209,21 @@ sysprof_poll(struct file *filp, poll_table *poll_table)
static int
sysprof_open(struct inode *inode, struct file *file)
{
register_timer_hook (timer_notify);
int retval;
if (atomic_inc_return(&client_count) == 1)
retval = register_timer_hook (timer_notify);
file->private_data = head;
return 0;
return retval;
}
static int
sysprof_release(struct inode *inode, struct file *file)
{
unregister_timer_hook (timer_notify);
if (atomic_dec_return(&client_count) == 0)
unregister_timer_hook (timer_notify);
return 0;
}