diff options
| author | Kristian Høgsberg <krh@redhat.com> | 2005-12-20 22:45:34 +0000 |
|---|---|---|
| committer | Kristian Høgsberg <krh@src.gnome.org> | 2005-12-20 22:45:34 +0000 |
| commit | 3c8bde00b4fa9035934be5b90b865adc73c14a26 (patch) | |
| tree | e0dbed9bac4772ef06b6f00afd67f6f7d444baf8 /module | |
| parent | acc0ee9ec976d737cdb91d849f0629639a2e3825 (diff) | |
Remove left over debug print out and add support for multiple clients
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).
Diffstat (limited to 'module')
| -rw-r--r-- | module/sysprof-module.c | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/module/sysprof-module.c b/module/sysprof-module.c index d8c1a0e..d381590 100644 --- a/module/sysprof-module.c +++ b/module/sysprof-module.c @@ -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; } |