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// SPDX-License-Identifier: GPL-3.0-or-later
#include "../libnetdata.h"
static size_t default_stacksize = 0, wanted_stacksize = 0;
static pthread_attr_t *attr = NULL;
// ----------------------------------------------------------------------------
// per thread data
typedef struct {
void *arg;
pthread_t *thread;
const char *tag;
void *(*start_routine) (void *);
NETDATA_THREAD_OPTIONS options;
} NETDATA_THREAD;
static __thread NETDATA_THREAD *netdata_thread = NULL;
const char *netdata_thread_tag(void) {
return ((netdata_thread && netdata_thread->tag && *netdata_thread->tag)?netdata_thread->tag:"MAIN");
}
// ----------------------------------------------------------------------------
// compatibility library functions
pid_t gettid(void) {
#ifdef __FreeBSD__
return (pid_t)pthread_getthreadid_np();
#elif defined(__APPLE__)
#if (defined __MAC_OS_X_VERSION_MIN_REQUIRED && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1060)
uint64_t curthreadid;
pthread_threadid_np(NULL, &curthreadid);
return (pid_t)curthreadid;
#else /* __MAC_OS_X_VERSION_MIN_REQUIRED */
return (pid_t)pthread_self;
#endif /* __MAC_OS_X_VERSION_MIN_REQUIRED */
#else /* __APPLE__*/
return (pid_t)syscall(SYS_gettid);
#endif /* __FreeBSD__, __APPLE__*/
}
// ----------------------------------------------------------------------------
// early initialization
size_t netdata_threads_init(void) {
int i;
// --------------------------------------------------------------------
// get the required stack size of the threads of netdata
attr = callocz(1, sizeof(pthread_attr_t));
i = pthread_attr_init(attr);
if(i != 0)
fatal("pthread_attr_init() failed with code %d.", i);
i = pthread_attr_getstacksize(attr, &default_stacksize);
if(i != 0)
fatal("pthread_attr_getstacksize() failed with code %d.", i);
else
debug(D_OPTIONS, "initial pthread stack size is %zu bytes", default_stacksize);
return default_stacksize;
}
// ----------------------------------------------------------------------------
// late initialization
void netdata_threads_init_after_fork(size_t stacksize) {
wanted_stacksize = stacksize;
int i;
// ------------------------------------------------------------------------
// set default pthread stack size
if(attr && default_stacksize < wanted_stacksize && wanted_stacksize > 0) {
i = pthread_attr_setstacksize(attr, wanted_stacksize);
if(i != 0)
fatal("pthread_attr_setstacksize() to %zu bytes, failed with code %d.", wanted_stacksize, i);
else
debug(D_SYSTEM, "Successfully set pthread stacksize to %zu bytes", wanted_stacksize);
}
}
// ----------------------------------------------------------------------------
// netdata_thread_create
static void thread_cleanup(void *ptr) {
if(netdata_thread != ptr) {
NETDATA_THREAD *info = (NETDATA_THREAD *)ptr;
error("THREADS: internal error - thread local variable does not match the one passed to this function. Expected thread '%s', passed thread '%s'", netdata_thread->tag, info->tag);
}
if(!(netdata_thread->options & NETDATA_THREAD_OPTION_DONT_LOG_CLEANUP))
info("thread with task id %d finished", gettid());
freez((void *)netdata_thread->tag);
netdata_thread->tag = NULL;
freez(netdata_thread);
netdata_thread = NULL;
}
static void *thread_start(void *ptr) {
netdata_thread = (NETDATA_THREAD *)ptr;
if(!(netdata_thread->options & NETDATA_THREAD_OPTION_DONT_LOG_STARTUP))
info("thread created with task id %d", gettid());
if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
error("cannot set pthread cancel type to DEFERRED.");
if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
error("cannot set pthread cancel state to ENABLE.");
void *ret = NULL;
pthread_cleanup_push(thread_cleanup, ptr);
ret = netdata_thread->start_routine(netdata_thread->arg);
pthread_cleanup_pop(1);
return ret;
}
int netdata_thread_create(netdata_thread_t *thread, const char *tag, NETDATA_THREAD_OPTIONS options, void *(*start_routine) (void *), void *arg) {
NETDATA_THREAD *info = mallocz(sizeof(NETDATA_THREAD));
info->arg = arg;
info->thread = thread;
info->tag = strdupz(tag);
info->start_routine = start_routine;
info->options = options;
int ret = pthread_create(thread, attr, thread_start, info);
if(ret != 0)
error("failed to create new thread for %s. pthread_create() failed with code %d", tag, ret);
else {
if (!(options & NETDATA_THREAD_OPTION_JOINABLE)) {
int ret2 = pthread_detach(*thread);
if (ret2 != 0)
error("cannot request detach of newly created %s thread. pthread_detach() failed with code %d", tag, ret2);
}
}
return ret;
}
// ----------------------------------------------------------------------------
// netdata_thread_cancel
int netdata_thread_cancel(netdata_thread_t thread) {
int ret = pthread_cancel(thread);
if(ret != 0)
error("cannot cancel thread. pthread_cancel() failed with code %d.", ret);
return ret;
}
// ----------------------------------------------------------------------------
// netdata_thread_join
int netdata_thread_join(netdata_thread_t thread, void **retval) {
int ret = pthread_join(thread, retval);
if(ret != 0)
error("cannot join thread. pthread_join() failed with code %d.", ret);
return ret;
}
int netdata_thread_detach(pthread_t thread) {
int ret = pthread_detach(thread);
if(ret != 0)
error("cannot detach thread. pthread_detach() failed with code %d.", ret);
return ret;
}
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