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New API call Xorriso_peek_outlists()

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This commit is contained in:
Thomas Schmitt
2012-09-15 17:04:32 +00:00
parent 6338febf8f
commit 634b20ec05
7 changed files with 175 additions and 26 deletions
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1
libisoburn/libisoburn.ver
View File

@@ -292,6 +292,7 @@ Xorriso_option_write_type;
Xorriso_option_xattr;
Xorriso_option_zisofs;
Xorriso_parse_line;
Xorriso_peek_outlists;
Xorriso_prescan_args;
Xorriso_process_errfile;
Xorriso_process_msg_queues;

8
xorriso/base_obj.c
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@@ -328,6 +328,8 @@ int Xorriso_new(struct XorrisO ** xorriso,char *progname, int flag)
m->msgw_info_handler= NULL;
m->msgw_info_handle= NULL;
m->msgw_stack_handle= -1;
m->msgw_msg_pending= 0;
m->msgw_fetch_lock_ini= 0;
m->msglist_stackfill= 0;
m->status_history_max= Xorriso_status_history_maX;
m->scsi_log= 0;
@@ -465,6 +467,10 @@ int Xorriso_new(struct XorrisO ** xorriso,char *progname, int flag)
if(ret != 0)
goto failure;
m->msg_watcher_lock_ini= 1;
ret= pthread_mutex_init(&(m->msgw_fetch_lock), NULL);
if(ret != 0)
goto failure;
m->msgw_fetch_lock_ini= 1;
if(leafname != NULL)
free(leafname);
@@ -558,6 +564,8 @@ int Xorriso_destroy(struct XorrisO **xorriso, int flag)
pthread_mutex_destroy(&(m->problem_status_lock));
if(m->msg_watcher_lock_ini)
pthread_mutex_destroy(&(m->msg_watcher_lock));
if(m->msgw_fetch_lock_ini)
pthread_mutex_destroy(&(m->msgw_fetch_lock));
free((char *) m);
*xorriso= NULL;

20
xorriso/parse_exec.c
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@@ -1726,7 +1726,7 @@ next_command:;
/* Test setup for for Xorriso_push_outlists() et.al. */
{
int stack_handle = -1, line_count;
int stack_handle = -1, line_count= 0;
struct Xorriso_lsT *result_list, *info_list;
int Xorriso_process_msg_lists(struct XorrisO *xorriso,
struct Xorriso_lsT *result_list,
@@ -1736,12 +1736,11 @@ next_command:;
(*idx)++;
if(strcmp(arg1, "push") == 0) {
ret= Xorriso_push_outlists(xorriso, &stack_handle, 3);
fprintf(stderr, "xorriso -test: Xorriso_push() = %d, handle = %d\n",
fprintf(stderr, "xorriso -test: push = %d, handle = %d\n",
ret, stack_handle);
} else if(strcmp(arg1, "pull") == 0) {
ret= Xorriso_pull_outlists(xorriso, -1, &result_list, &info_list, 0);
fprintf(stderr, "xorriso -test: Xorriso_push() = %d, handle = %d\n",
ret, stack_handle);
fprintf(stderr, "xorriso -test: pull = %d\n", ret);
if(ret > 0) {
ret= Xorriso_process_msg_lists(xorriso, result_list, info_list,
&line_count, 0);
@@ -1751,8 +1750,7 @@ next_command:;
}
} else if(strcmp(arg1, "fetch") == 0) {
ret= Xorriso_fetch_outlists(xorriso, -1, &result_list, &info_list, 0);
fprintf(stderr, "xorriso -test: Xorriso_fetch() = %d, handle = %d\n",
ret, stack_handle);
fprintf(stderr, "xorriso -test: fetch = %d\n", ret);
if(ret > 0) {
ret= Xorriso_process_msg_lists(xorriso, result_list, info_list,
&line_count, 0);
@@ -1760,6 +1758,16 @@ next_command:;
"xorriso -test: Xorriso_process_msg_lists() = %d, line_count = %d\n",
ret, line_count);
}
} else if(strcmp(arg1, "peek") == 0) {
ret= Xorriso_peek_outlists(xorriso, -1, 0, 0);
fprintf(stderr, "xorriso -test: peek = %d\n", ret);
} else if(strcmp(arg1, "sleep_peek") == 0) {
usleep(1000000);
ret= Xorriso_peek_outlists(xorriso, -1, 0, 0);
fprintf(stderr, "xorriso -test: sleep_peek = %d\n", ret);
} else if(strcmp(arg1, "peek_loop") == 0) {
ret= Xorriso_peek_outlists(xorriso, -1, 3, 4);
fprintf(stderr, "xorriso -test: peek_loop = %d\n", ret);
} else if(strcmp(arg1, "start") == 0) {
ret= Xorriso_start_msg_watcher(xorriso, NULL, NULL, NULL, NULL, 0);
fprintf(stderr, "xorriso -test: Xorriso_start_msg_watcher() = %d\n", ret);

140
xorriso/text_io.c
View File

@@ -522,44 +522,76 @@ ex:;
}
static int Xorriso_lock_outlists(struct XorrisO *xorriso, int flag)
/* @param flag bit0= no error message in case of failure
*/
static int Xorriso_obtain_lock(struct XorrisO *xorriso,
pthread_mutex_t *lock_handle,
char *purpose, int flag)
{
int ret;
static int complaints= 0, complaint_limit= 5;
ret= pthread_mutex_lock(&(xorriso->result_msglists_lock));
ret= pthread_mutex_lock(lock_handle);
if(ret != 0) {
if(flag & 1)
return(-1);
/* Cannot report failure through the failing message output system */
complaints++;
if(complaints < complaint_limit)
if(complaints <= complaint_limit)
fprintf(stderr,
"xorriso : pthread_mutex_lock() for outlists returns %d\n",
ret);
"xorriso : pthread_mutex_lock() for %s returns %d\n",
purpose, ret);
return(-1);
}
return(1);
}
static int Xorriso_unlock_outlists(struct XorrisO *xorriso, int flag)
/* @param flag bit0= no error message in case of failure
*/
static int Xorriso_release_lock(struct XorrisO *xorriso,
pthread_mutex_t *lock_handle,
char *purpose, int flag)
{
int ret;
static int complaints= 0, complaint_limit= 5;
ret= pthread_mutex_unlock(&(xorriso->result_msglists_lock));
ret= pthread_mutex_unlock(lock_handle);
if(ret != 0) {
if(flag & 1)
return(0);
/* Cannot report failure through the failing message output system */
complaints++;
if(complaints < complaint_limit)
if(complaints <= complaint_limit)
fprintf(stderr,
"xorriso : pthread_mutex_unlock() for outlists returns %d\n",
ret);
"xorriso : pthread_mutex_unlock() for %s returns %d\n",
purpose, ret);
return(0);
}
return(1);
}
static int Xorriso_lock_outlists(struct XorrisO *xorriso, int flag)
{
int ret;
ret= Xorriso_obtain_lock(xorriso, &(xorriso->result_msglists_lock),
"outlists", 0);
return(ret);
}
static int Xorriso_unlock_outlists(struct XorrisO *xorriso, int flag)
{
int ret;
ret= Xorriso_release_lock(xorriso, &(xorriso->result_msglists_lock),
"outlists", 0);
return(ret);
}
static int Xorriso_write_to_msglist(struct XorrisO *xorriso,
struct Xorriso_lsT **xorriso_msglist,
char *text, int flag)
@@ -850,13 +882,6 @@ int Xorriso_fetch_outlists(struct XorrisO *xorriso, int stack_handle,
#ifdef Xorriso_fetch_with_msg_queueS
/* >>> This would need more locking around
xorriso->problem_status= sev;
Probably also locking of
Xorriso_info(), Xorriso_result
because unredirected output could collide.
*/
ret= Xorriso_process_msg_queues(xorriso, 0);
if(ret <= 0)
goto ex;
@@ -896,6 +921,59 @@ ex:;
}
int Xorriso_peek_outlists(struct XorrisO *xorriso, int stack_handle,
int timeout, int flag)
{
int ret, locked= 0, yes= 0;
static int u_wait= 19000;
time_t start_time;
if((flag & 3) == 0)
flag|= 3;
if(stack_handle == -1)
stack_handle= xorriso->msglist_stackfill - 1;
start_time= time(NULL);
try_again:;
ret= Xorriso_obtain_lock(xorriso, &(xorriso->msgw_fetch_lock),
"message watcher fetch operation", 0);
if(ret <= 0)
{yes= -2; goto ex;}
locked= 1;
yes= 0;
if(stack_handle < 0 || stack_handle >= xorriso->msglist_stackfill)
{yes= -1; goto ex;}
if(flag & 1)
yes|= (xorriso->result_msglists[stack_handle] != NULL);
if(flag & 2)
yes|= (xorriso->info_msglists[stack_handle] != NULL);
if(xorriso->msg_watcher_state == 2 && xorriso->msgw_msg_pending)
yes|= 2;
ret= Xorriso_release_lock(xorriso, &(xorriso->msgw_fetch_lock),
"message watcher fetch operation", 0);
if(ret <= 0)
{yes= -2; goto ex;}
locked= 0;
if(yes && (flag & 4)) {
usleep(u_wait);
if(time(NULL) <= start_time + timeout)
goto try_again;
}
ex:;
if(locked) {
ret= Xorriso_release_lock(xorriso, &(xorriso->msgw_fetch_lock),
"message watcher fetch operation", 0);
if(ret <= 0 && yes >= 0)
yes= -2;
}
return(yes);
}
int Xorriso_pull_outlists(struct XorrisO *xorriso, int stack_handle,
struct Xorriso_lsT **result_list,
struct Xorriso_lsT **info_list, int flag)
@@ -1025,18 +1103,31 @@ static void *Xorriso_msg_watcher(void *state_pt)
if(xorriso->msg_watcher_state == 3)
break;
Xorriso_obtain_lock(xorriso, &(xorriso->msgw_fetch_lock),
"message watcher fetch operation", 1);
xorriso->msgw_msg_pending= 1;
ret= Xorriso_fetch_outlists(xorriso, -1, &result_list, &info_list, 3);
if(ret < 0)
break;
if(ret > 0) {
/* Process fetched lines */
xorriso->msgw_msg_pending= 2;
Xorriso_release_lock(xorriso, &(xorriso->msgw_fetch_lock),
"message watcher fetch operation", 1);
ret= Xorriso_process_msg_lists(xorriso, result_list, info_list,
&line_count, 0);
xorriso->msgw_msg_pending= 0;
Xorriso_lst_destroy_all(&result_list, 0);
Xorriso_lst_destroy_all(&info_list, 0);
if(ret < 0)
break;
} else {
xorriso->msgw_msg_pending= 0;
Xorriso_release_lock(xorriso, &(xorriso->msgw_fetch_lock),
"message watcher fetch operation", 1);
}
xorriso->msgw_msg_pending= 0;
if(ret < 0)
break;
if(line_count < sleep_thresh)
usleep(u_wait);
@@ -1179,13 +1270,24 @@ int Xorriso_stop_msg_watcher(struct XorrisO *xorriso, int flag)
usleep(u_wait);
}
Xorriso_obtain_lock(xorriso, &(xorriso->msgw_fetch_lock),
"message watcher fetch operation", 1);
xorriso->msgw_msg_pending= 1;
ret= Xorriso_pull_outlists(xorriso, xorriso->msgw_stack_handle,
&result_list, &info_list, 0);
if(ret > 0) {
xorriso->msgw_msg_pending= 2;
Xorriso_release_lock(xorriso, &(xorriso->msgw_fetch_lock),
"message watcher fetch operation", 1);
Xorriso_process_msg_lists(xorriso, result_list, info_list,
&line_count, 0);
xorriso->msgw_msg_pending= 0;
Xorriso_lst_destroy_all(&result_list, 0);
Xorriso_lst_destroy_all(&info_list, 0);
} else {
xorriso->msgw_msg_pending= 0;
Xorriso_release_lock(xorriso, &(xorriso->msgw_fetch_lock),
"message watcher fetch operation", 1);
}
xorriso->msgw_result_handler= NULL;

27
xorriso/xorriso.h
View File

@@ -628,6 +628,33 @@ int Xorriso_fetch_outlists(struct XorrisO *xorriso, int stack_handle,
struct Xorriso_lsT **info_list, int flag);
/** Inquire whether messages are pending in redirected result and info channel.
This may be used to determine whether a concurrent message watcher already
has obtained all pending messages.
@since 1.2.6
@param xorriso The environment handle
@param stack_handle An id number returned by Xorriso_push_outlists()
and not yet revoked by Xorriso_pull_outlists().
Submit -1 to address the most recent valid id.
@param timeout Number of seconds after which to return despite
flag bit 2
@param flag Bitfield for control purposes
bit0= fetch result channel
bit1= fetch info channel
bit2= wait and retry until return is 0 or -1
If bit0 and bit1 are 0, both channels get fetched.
@return If > 0:
bit0= messages are pending in outlists
bit1= message watcher is processing fetched messages
Else:
0= no messages are pending anywhere
-1= inappropriate stack_handle
-2= locking failed
*/
int Xorriso_peek_outlists(struct XorrisO *xorriso, int stack_handle,
int timeout, int flag);
/** Disable the redirection given by stack_handle. If it was the current
receiver of messages then switch output to the next older redirection
resp. to the normal channels if no redirections are stacked any more.

3
xorriso/xorriso_private.h
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@@ -587,6 +587,9 @@ struct XorrisO { /* the global context of xorriso */
int (*msgw_info_handler)(void *handle, char *text);
void *msgw_info_handle;
int msgw_stack_handle;
int msgw_msg_pending; /* 0=no, 1=fetching(i.e. maybe) , 2=yes */
int msgw_fetch_lock_ini;
pthread_mutex_t msgw_fetch_lock;
int status_history_max; /* for -status long_history */

2
xorriso/xorriso_timestamp.h
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@@ -1 +1 @@
#define Xorriso_timestamP "2012.09.15.095146"
#define Xorriso_timestamP "2012.09.15.170346"