libburnia
/
libburn
2
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
Browse Source

Giving up use of function pthread_cancel()

release-1.5.2.pl01
Thomas Schmitt 6 years ago
parent
6f6bf688d9
commit
724d518dbc
5 changed files with 95 additions and 32 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 2
      cdrskin/cdrskin_timestamp.h
  2. 82
      libburn/async.c
  3. 10
      libburn/async.h
  4. 24
      libburn/file.c
  5. 9
      libburn/file.h

2
cdrskin/cdrskin_timestamp.h
Unescape View File

@ -1 +1 @@
#define Cdrskin_timestamP "2016.11.18.132335"
#define Cdrskin_timestamP "2017.01.28.200155"

82
libburn/async.c
Unescape View File

@ -1,7 +1,7 @@
/* -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 8; -*- */
/* Copyright (c) 2004 - 2006 Derek Foreman, Ben Jansens
Copyright (c) 2006 - 2014 Thomas Schmitt <scdbackup@gmx.net>
Copyright (c) 2006 - 2017 Thomas Schmitt <scdbackup@gmx.net>
Provided under GPL version 2 or later.
*/
@ -123,6 +123,42 @@ struct w_list
static struct w_list *workers = NULL;
int burn_async_manage_lock(int mode)
{
int ret;
static pthread_mutex_t access_lock;
static int mutex_initialized = 0;
static int mutex_locked = 0;
if (mode == BURN_ASYNC_LOCK_INIT) {
if (mutex_initialized)
return 2;
ret = pthread_mutex_init(&access_lock, NULL);
if (ret != 0)
return 0;
mutex_initialized = 1;
return 1;
}
if (!mutex_initialized)
return 0;
if (mode == BURN_ASYNC_LOCK_OBTAIN) {
ret = pthread_mutex_lock(&access_lock);
if (ret != 0)
return 0;
mutex_locked = 1;
} else if (mode == BURN_ASYNC_LOCK_RELEASE) {
if (!mutex_locked)
return 2;
ret = pthread_mutex_unlock(&access_lock);
if (ret != 0)
return 0;
mutex_locked = 0;
}
return 1;
}
static struct w_list *find_worker(struct burn_drive *d)
{
struct w_list *a;
@ -149,9 +185,8 @@ static void add_worker(int w_type, struct burn_drive *d,
a->drive = d;
a->u = *data;
/*
memcpy(&(a->u), data, sizeof(union w_list_data));
*/
burn_async_manage_lock(BURN_ASYNC_LOCK_INIT);
/* insert at front of the list */
a->next = workers;
@ -162,6 +197,7 @@ static void add_worker(int w_type, struct burn_drive *d,
d->busy = BURN_DRIVE_SPAWNING;
#ifdef Libburn_create_detached_threadS
/* ts A71019 :
Trying to start the threads detached to get rid of the zombies
which do neither react on pthread_join() nor on pthread_detach().
@ -169,12 +205,12 @@ static void add_worker(int w_type, struct burn_drive *d,
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
attr_pt= &attr;
/*
libdax_msgs_submit(libdax_messenger, -1, 0x00020158,
LIBDAX_MSGS_SEV_DEBUG, LIBDAX_MSGS_PRIO_LOW,
"add_worker(): Creating detached thread.", 0, 0);
*/
#endif
#endif /* Libburn_create_detached_threadS */
/* Worker specific locks are to be released early by the worker */
if (f == (WorkerFunc) burn_fifo_source_shoveller)
burn_async_manage_lock(BURN_ASYNC_LOCK_OBTAIN);
if (pthread_create(&a->thread, attr_pt, f, a)) {
free(a);
@ -704,7 +740,6 @@ ex:;
static void *fifo_worker_func(struct w_list *w)
{
int old;
#define Libburn_protect_fifo_threaD 1
@ -718,10 +753,6 @@ static void *fifo_worker_func(struct w_list *w)
pthread_sigmask(SIG_SETMASK, &sigset, &oldset);
#endif /* Libburn_protect_fifo_threaD */
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &old);
pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &old);
/* Note: Only burn_fifo_abort() shall cancel the fifo thread */
burn_fifo_source_shoveller(w->u.fifo.source, w->u.fifo.flag);
remove_worker(pthread_self());
@ -764,18 +795,19 @@ int burn_fifo_abort(struct burn_source_fifo *fs, int flag)
int ret;
pthread_t pt;
if (fs->thread_is_valid <= 0 || fs->thread_handle == NULL)
return(2);
burn_async_manage_lock(BURN_ASYNC_LOCK_OBTAIN);
#ifdef NIX
libdax_msgs_submit(libdax_messenger, -1, 0x00000002,
LIBDAX_MSGS_SEV_DEBUG, LIBDAX_MSGS_PRIO_HIGH,
"Aborting running burn_source_fifo thread", 0, 0);
#endif /* NIX */
if (fs->thread_is_valid <= 0 || fs->thread_handle == NULL) {
burn_async_manage_lock(BURN_ASYNC_LOCK_RELEASE);
return 2;
}
pt = *((pthread_t *) fs->thread_handle);
burn_async_manage_lock(BURN_ASYNC_LOCK_RELEASE);
fs->do_abort = 1;
ret = pthread_join(pt, NULL);
pt= *((pthread_t *) fs->thread_handle);
remove_worker(pt);
ret = pthread_cancel(pt);
return (ret == 0);
}

10
libburn/async.h
Unescape View File

@ -1,5 +1,10 @@
/* -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 8; -*- */
/* Copyright (c) 2004 - 2006 Derek Foreman, Ben Jansens
Copyright (c) 2006 - 2017 Thomas Schmitt <scdbackup@gmx.net>
Provided under GPL version 2 or later.
*/
#ifndef BURN__ASYNC_H
#define BURN__ASYNC_H
@ -14,5 +19,10 @@ int burn_fifo_start(struct burn_source *source, int flag);
/* To abort a running fifo thread before the fifo object gets deleted */
int burn_fifo_abort(struct burn_source_fifo *fs, int flag);
/* ts B70126 */
#define BURN_ASYNC_LOCK_RELEASE 0
#define BURN_ASYNC_LOCK_OBTAIN 1
#define BURN_ASYNC_LOCK_INIT 2
int burn_async_manage_lock(int mode);
#endif /* BURN__ASYNC_H */

24
libburn/file.c
Unescape View File

@ -1,7 +1,7 @@
/* -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 8; -*- */
/* Copyright (c) 2004 - 2006 Derek Foreman, Ben Jansens
Copyright (c) 2006 - 2014 Thomas Schmitt <scdbackup@gmx.net>
Copyright (c) 2006 - 2017 Thomas Schmitt <scdbackup@gmx.net>
Provided under GPL version 2 or later.
*/
@ -356,13 +356,20 @@ int burn_fifo_source_shoveller(struct burn_source *source, int flag)
fs->thread_pid = getpid();
fs->thread_is_valid = 1;
/* Lock was obtained by async.c:add_worker() */
burn_async_manage_lock(BURN_ASYNC_LOCK_RELEASE);
bufsize = fs->chunksize * fs->chunks;
while (!fs->end_of_consumption) {
if (fs->do_abort)
goto emergency_exit;
/* wait for enough buffer space available */
wpos = fs->buf_writepos;
counted = 0;
while (1) {
if (fs->do_abort)
goto emergency_exit;
rpos = fs->buf_readpos;
diff = rpos - wpos;
trans_end = 0;
@ -405,6 +412,8 @@ int burn_fifo_source_shoveller(struct burn_source *source, int flag)
}
/* Obtain next chunk */
if (fs->do_abort)
goto emergency_exit;
if (fs->inp->read != NULL)
ret = fs->inp->read(fs->inp,
(unsigned char *) bufpt, fs->inp_read_size);
@ -430,6 +439,8 @@ int burn_fifo_source_shoveller(struct burn_source *source, int flag)
fs->put_counter++;
/* activate read chunk */
if (fs->do_abort)
goto emergency_exit;
if (ret > fs->inp_read_size)
/* beware of ill custom burn_source */
ret = fs->inp_read_size;
@ -463,8 +474,11 @@ int burn_fifo_source_shoveller(struct burn_source *source, int flag)
fs->end_of_input = 1;
/* wait for end of reading by consumer */;
while (fs->buf_readpos != fs->buf_writepos && !fs->end_of_consumption)
fifo_sleep(0);
while (fs->buf_readpos != fs->buf_writepos && !fs->end_of_consumption) {
if (fs->do_abort)
goto emergency_exit;
fifo_sleep(0);
}
/* destroy ring buffer */;
if (!fs->end_of_consumption)
@ -481,8 +495,11 @@ int burn_fifo_source_shoveller(struct burn_source *source, int flag)
((size_t) fs->chunksize) * (size_t) fs->chunks, 0);
fs->buf = NULL;
emergency_exit:;
burn_async_manage_lock(BURN_ASYNC_LOCK_OBTAIN);
fs->thread_handle= NULL;
fs->thread_is_valid = 0;
burn_async_manage_lock(BURN_ASYNC_LOCK_RELEASE);
return (fs->input_error == 0);
}
@ -524,6 +541,7 @@ struct burn_source *burn_fifo_source_new(struct burn_source *inp,
fs->thread_handle = NULL;
fs->thread_pid = 0;
fs->thread_is_valid = 0;
fs->do_abort = 0;
fs->inp = NULL; /* set later */
if (flag & 1)
fs->inp_read_size = 32 * 1024;

9
libburn/file.h
Unescape View File

@ -1,7 +1,7 @@
/* -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 8; -*- */
/* Copyright (c) 2004 - 2006 Derek Foreman, Ben Jansens
Copyright (c) 2006 - 2010 Thomas Schmitt <scdbackup@gmx.net>
Copyright (c) 2006 - 2017 Thomas Schmitt <scdbackup@gmx.net>
Provided under GPL version 2 or later.
*/
@ -27,8 +27,8 @@ struct burn_source_fifo {
/* The fifo stays inactive and unequipped with eventual resources
until its read() method is called for the first time.
Only then burn_fifo_start() gets called, allocates the complete
resources, starts a thread with burn_fifo_source_shuffler()
which shuffles data and finally destroys the resources.
resources, starts a thread with burn_fifo_source_shoveller()
which shovels data and finally destroys the resources.
This late start is to stay modest in case of multiple tracks
in one disc.
*/
@ -38,6 +38,9 @@ struct burn_source_fifo {
int thread_pid;
int thread_is_valid;
/* The shoveller aborts if this is 1. Resource leaks are possible. */
volatile int do_abort;
/* the burn_source for which this fifo is acting as proxy */
struct burn_source *inp;
int inp_read_size;

Write Preview
Loading…
Cancel
Save