* interface for collectd plugins written in perl.
*/
-/* do not automatically get the thread specific perl interpreter */
+/* do not automatically get the thread specific Perl interpreter */
#define PERL_NO_GET_CONTEXT
#define DONT_POISON_SPRINTF_YET 1
#include "collectd.h"
-#undef DONT_POISON_SPRINTF_YET
-#include "configfile.h"
+#undef DONT_POISON_SPRINTF_YET
#if HAVE_STDBOOL_H
# include <stdbool.h>
#include "filter_chain.h"
-#include <pthread.h>
-
#if !defined(USE_ITHREADS)
# error "Perl does not support ithreads!"
#endif /* !defined(USE_ITHREADS) */
typedef struct c_ithread_s {
/* the thread's Perl interpreter */
PerlInterpreter *interp;
+ _Bool running; /* thread is inside Perl interpreter */
+ _Bool shutdown;
+ pthread_t pthread;
/* double linked list of threads */
struct c_ithread_s *prev;
#endif /* COLLECT_DEBUG */
pthread_mutex_t mutex;
+ pthread_mutexattr_t mutexattr;
} c_ithread_list_t;
/* name / user_data for Perl matches / targets */
static size_t av2value (pTHX_ char *name, AV *array, value_t *value, size_t array_len)
{
const data_set_t *ds;
- size_t i;
if ((NULL == name) || (NULL == array) || (NULL == value) || (array_len == 0))
return 0;
name, array_len, ds->ds_num);
}
- for (i = 0; i < ds->ds_num; ++i) {
+ for (size_t i = 0; i < ds->ds_num; ++i) {
SV **tmp = av_fetch (array, i, 0);
if (NULL != tmp) {
static int av2data_set (pTHX_ AV *array, char *name, data_set_t *ds)
{
- int len, i;
+ int len;
if ((NULL == array) || (NULL == name) || (NULL == ds))
return -1;
ds->ds = smalloc ((len + 1) * sizeof (*ds->ds));
ds->ds_num = len + 1;
- for (i = 0; i <= len; ++i) {
+ for (int i = 0; i <= len; ++i) {
SV **elem = av_fetch (array, i, 0);
if (NULL == elem) {
notification_meta_t **m = meta;
int len = av_len (array);
- int i;
- for (i = 0; i <= len; ++i) {
+ for (int i = 0; i <= len; ++i) {
SV **tmp = av_fetch (array, i, 0);
HV *hash;
static int data_set2av (pTHX_ data_set_t *ds, AV *array)
{
- size_t i;
-
if ((NULL == ds) || (NULL == array))
return -1;
av_extend (array, ds->ds_num);
- for (i = 0; i < ds->ds_num; ++i) {
+ for (size_t i = 0; i < ds->ds_num; ++i) {
HV *source = newHV ();
if (NULL == hv_store (source, "name", 4,
static int notification_meta2av (pTHX_ notification_meta_t *meta, AV *array)
{
int meta_num = 0;
- int i;
while (meta) {
++meta_num;
av_extend (array, meta_num);
- for (i = 0; NULL != meta; meta = meta->next, ++i) {
+ for (int i = 0; NULL != meta; meta = meta->next, ++i) {
HV *m = newHV ();
SV *value;
static int oconfig_item2hv (pTHX_ oconfig_item_t *ci, HV *hash)
{
- int i;
-
AV *values;
AV *children;
return -1;
}
- for (i = 0; i < ci->values_num; ++i) {
+ for (int i = 0; i < ci->values_num; ++i) {
SV *value;
switch (ci->values[i].type) {
return -1;
}
- for (i = 0; i < ci->children_num; ++i) {
+ for (int i = 0; i < ci->children_num; ++i) {
HV *child = newHV ();
if (0 != oconfig_item2hv (aTHX_ ci->children + i, child)) {
*/
static int pplugin_dispatch_notification (pTHX_ HV *notif)
{
- notification_t n;
+ notification_t n = { 0 };
int ret;
if (NULL == notif)
return -1;
- memset (&n, 0, sizeof (n));
-
if (0 != hv2notification (aTHX_ notif, &n))
return -1;
} /* static int pplugin_dispatch_notification (HV *) */
/*
+ * Call perl sub with thread locking flags handled.
+ */
+static int call_pv_locked (pTHX_ const char* sub_name)
+{
+ _Bool old_running;
+ int ret;
+
+ c_ithread_t *t = (c_ithread_t *)pthread_getspecific(perl_thr_key);
+ if (t == NULL) /* thread destroyed */
+ return 0;
+
+ old_running = t->running;
+ t->running = 1;
+
+ if (t->shutdown) {
+ t->running = old_running;
+ return 0;
+ }
+
+ ret = call_pv (sub_name, G_SCALAR);
+
+ t->running = old_running;
+ return ret;
+} /* static int call_pv_locked (pTHX, *sub_name) */
+
+/*
* Call all working functions of the given type.
*/
static int pplugin_call_all (pTHX_ int type, ...)
PUTBACK;
- retvals = call_pv ("Collectd::plugin_call_all", G_SCALAR);
+ retvals = call_pv_locked (aTHX_ "Collectd::plugin_call_all");
SPAGAIN;
if (0 < retvals) {
} /* static int pplugin_call_all (int, ...) */
/*
- * collectd's perl interpreter based thread implementation.
+ * collectd's Perl interpreter based thread implementation.
*
* This has been inspired by Perl's ithreads introduced in version 5.6.0.
*/
t->prev = perl_threads->tail;
}
+ t->pthread = pthread_self();
+ t->running = 0;
+ t->shutdown = 0;
perl_threads->tail = t;
pthread_setspecific (perl_thr_key, (const void *)t);
PUTBACK;
- retvals = call_pv ("Collectd::fc_call", G_SCALAR);
+ retvals = call_pv_locked (aTHX_ "Collectd::fc_call");
if ((FC_CB_EXEC == cb_type) && (meta != NULL)) {
assert (pmeta != NULL);
static int perl_init (void)
{
+ int status;
dTHX;
if (NULL == perl_threads)
log_debug ("perl_init: c_ithread: interp = %p (active threads: %i)",
aTHX, perl_threads->number_of_threads);
- return pplugin_call_all (aTHX_ PLUGIN_INIT);
+
+ /* Lock the base thread to avoid race conditions with c_ithread_create().
+ * See https://github.com/collectd/collectd/issues/9 and
+ * https://github.com/collectd/collectd/issues/1706 for details.
+ */
+ assert (aTHX == perl_threads->head->interp);
+ pthread_mutex_lock (&perl_threads->mutex);
+
+ status = pplugin_call_all (aTHX_ PLUGIN_INIT);
+
+ pthread_mutex_unlock (&perl_threads->mutex);
+
+ return status;
} /* static int perl_init (void) */
static int perl_read (void)
/* Lock the base thread if this is not called from one of the read threads
* to avoid race conditions with c_ithread_create(). See
- * https://github.com/collectd/collectd/issues/9 for details. */
+ * https://github.com/collectd/collectd/issues/9 for details.
+ */
+
if (aTHX == perl_threads->head->interp)
pthread_mutex_lock (&perl_threads->mutex);
static int perl_shutdown (void)
{
- c_ithread_t *t = NULL;
-
- int ret = 0;
+ c_ithread_t *t;
+ int ret;
dTHX;
return 0;
if (NULL == aTHX) {
- t = NULL;
-
pthread_mutex_lock (&perl_threads->mutex);
t = c_ithread_create (perl_threads->head->interp);
pthread_mutex_unlock (&perl_threads->mutex);
t = perl_threads->tail;
while (NULL != t) {
+ struct timespec ts_wait;
c_ithread_t *thr = t;
/* the pointer has to be advanced before destroying
* the thread as this will free the memory */
t = t->prev;
+ thr->shutdown = 1;
+ if (thr->running) {
+ /* Give some time to thread to exit from Perl interpreter */
+ WARNING ("perl shutdown: Thread is running inside Perl. Waiting.");
+ ts_wait.tv_sec = 0;
+ ts_wait.tv_nsec = 500000;
+ nanosleep (&ts_wait, NULL);
+ }
+ if (thr->running) {
+ pthread_kill (thr->pthread, SIGTERM);
+ ERROR ("perl shutdown: Thread hangs inside Perl. Thread killed.");
+ }
c_ithread_destroy (thr);
}
pthread_mutex_unlock (&perl_threads->mutex);
pthread_mutex_destroy (&perl_threads->mutex);
+ pthread_mutexattr_destroy (&perl_threads->mutexattr);
sfree (perl_threads);
SV *tmp = NULL;
char *file = __FILE__;
- int i = 0;
-
dXSUB_SYS;
/* enable usage of Perl modules using shared libraries */
newXS ("DynaLoader::boot_DynaLoader", boot_DynaLoader, file);
/* register API */
- for (i = 0; NULL != api[i].f; ++i)
+ for (int i = 0; NULL != api[i].f; ++i)
newXS (api[i].name, api[i].f, file);
stash = gv_stashpv ("Collectd", 1);
/* export "constants" */
- for (i = 0; '\0' != constants[i].name[0]; ++i)
+ for (int i = 0; '\0' != constants[i].name[0]; ++i)
newCONSTSUB (stash, constants[i].name, newSViv (constants[i].value));
/* export global variables
* accessing any such variable (this is basically the same as using
* tie() in Perl) */
/* global strings */
- for (i = 0; '\0' != g_strings[i].name[0]; ++i) {
+ for (int i = 0; '\0' != g_strings[i].name[0]; ++i) {
tmp = get_sv (g_strings[i].name, 1);
sv_magicext (tmp, NULL, PERL_MAGIC_ext, &g_pv_vtbl,
g_strings[i].var, 0);
log_info ("Initializing Perl interpreter...");
#if COLLECT_DEBUG
{
- int i = 0;
-
- for (i = 0; i < argc; ++i)
+ for (int i = 0; i < argc; ++i)
log_debug ("argv[%i] = \"%s\"", i, argv[i]);
}
#endif /* COLLECT_DEBUG */
perl_threads = smalloc (sizeof (*perl_threads));
memset (perl_threads, 0, sizeof (c_ithread_list_t));
- pthread_mutex_init (&perl_threads->mutex, NULL);
+ pthread_mutexattr_init(&perl_threads->mutexattr);
+ pthread_mutexattr_settype(&perl_threads->mutexattr, PTHREAD_MUTEX_RECURSIVE);
+ pthread_mutex_init (&perl_threads->mutex, &perl_threads->mutexattr);
/* locking the mutex should not be necessary at this point
* but let's just do it for the sake of completeness */
pthread_mutex_lock (&perl_threads->mutex);
aTHX = perl_threads->head->interp;
- log_debug ("perl_config: loading perl plugin \"%s\"", value);
+ log_debug ("perl_config: Loading Perl plugin \"%s\"", value);
load_module (PERL_LOADMOD_NOIMPORT,
newSVpv (module_name, strlen (module_name)), Nullsv);
return 0;
static int perl_config (oconfig_item_t *ci)
{
int status = 0;
- int i = 0;
dTHXa (NULL);
- for (i = 0; i < ci->children_num; ++i) {
+ for (int i = 0; i < ci->children_num; ++i) {
oconfig_item_t *c = ci->children + i;
int current_status = 0;
projects / collectd.git / blobdiff