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/********************************************************************
*
* Testing thread safety. Thread Cancellation safety
* -------------------------------------------------
*
* The main thread spawns a child to perform a series of dataset writes
* to a hdf5 file. The main thread and child thread synchronizes within
* a callback function called during a H5Diterate call afterwhich the
* main thread attempts to cancel the child thread.
*
* The cancellation should only work after the child thread has safely
* left the H5Diterate call.
*
* Temporary files generated:
* ttsafe_cancel.h5
*
* HDF5 APIs exercised in thread:
* H5Screate_simple, H5Tcopy, H5Tset_order, H5Dcreate, H5Dclose,
* H5Dwrite, H5Dread, H5Diterate, H5Tclose, H5Sclose.
*
* Created: May 15 2000
* Programmer: Chee Wai LEE
*
* Modification History
* --------------------
*
* 19 May 2000, Bill Wendling
* Changed so that it creates its own HDF5 file and removes it at cleanup
* time. Added num_errs flag.
*
********************************************************************/
#include "ttsafe.h"
#ifndef H5_HAVE_THREADSAFE
static int dummy; /* just to create a non-empty object file */
#else
#define FILENAME "ttsafe_cancel.h5"
#define DATASETNAME "commonname"
void *tts_cancel_thread(void *);
void tts_cancel_barrier(void);
herr_t tts_cancel_callback(void *, hid_t, hsize_t, hssize_t *, void *);
void cancellation_cleanup(void *);
hid_t cancel_file;
typedef struct cleanup_struct {
hid_t dataset;
hid_t datatype;
hid_t dataspace;
} cancel_cleanup_t;
pthread_t childthread;
pthread_mutex_t mutex;
pthread_cond_t cond;
void tts_cancel(void)
{
pthread_attr_t attribute;
hid_t dataset;
int buffer;
/* make thread scheduling global */
pthread_attr_init(&attribute);
#ifdef H5_HAVE_SYSTEM_SCOPE_THREADS
pthread_attr_setscope(&attribute, PTHREAD_SCOPE_SYSTEM);
#endif /* H5_HAVE_SYSTEM_SCOPE_THREADS */
/*
* Create a hdf5 file using H5F_ACC_TRUNC access, default file
* creation plist and default file access plist
*/
cancel_file = H5Fcreate(FILENAME, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
pthread_create(&childthread, &attribute, tts_cancel_thread, NULL);
tts_cancel_barrier();
pthread_cancel(childthread);
dataset = H5Dopen(cancel_file, DATASETNAME);
H5Dread(dataset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT,
&buffer);
if (buffer != 11) {
fprintf(stderr,
"operation unsuccessful with value at %d instead of 11\n",
buffer);
num_errs++;
}
H5Dclose(dataset);
H5Fclose(cancel_file);
/* Destroy the thread attribute */
pthread_attr_destroy(&attribute);
}
void *tts_cancel_thread(void *arg)
{
int datavalue;
int *buffer;
hid_t dataspace, datatype, dataset;
hsize_t dimsf[1]; /* dataset dimensions */
cancel_cleanup_t *cleanup_structure;
/* define dataspace for dataset */
dimsf[0] = 1;
dataspace = H5Screate_simple(1,dimsf,NULL);
/* define datatype for the data using native little endian integers */
datatype = H5Tcopy(H5T_NATIVE_INT);
H5Tset_order(datatype, H5T_ORDER_LE);
/* create a new dataset within the file */
dataset = H5Dcreate(cancel_file, DATASETNAME, datatype, dataspace,
H5P_DEFAULT);
/* If thread is cancelled, make cleanup call */
cleanup_structure = (cancel_cleanup_t*)malloc(sizeof(cancel_cleanup_t));
cleanup_structure->dataset = dataset;
cleanup_structure->datatype = datatype;
cleanup_structure->dataspace = dataspace;
pthread_cleanup_push(cancellation_cleanup, cleanup_structure);
datavalue = 1;
H5Dwrite(dataset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT,
&datavalue);
buffer = malloc(sizeof(int));
H5Dread(dataset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT,
buffer);
H5Diterate(buffer, H5T_NATIVE_INT, dataspace, tts_cancel_callback,
&dataset);
sleep(3);
datavalue = 100;
H5Dwrite(dataset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT,
&datavalue);
H5Dclose(dataset);
H5Tclose(datatype);
H5Sclose(dataspace);
/*
* Required by pthreads. The argument 0 pops the stack but does not
* execute the cleanup routine.
*/
pthread_cleanup_pop(0);
return NULL;
}
herr_t tts_cancel_callback(void *elem, hid_t type_id, hsize_t ndim,
hssize_t *point, void *operator_data)
{
int value = *(int *)elem;
hid_t dataset = *(hid_t *)operator_data;
tts_cancel_barrier();
sleep(3);
if (value != 1) {
fprintf(stderr, "Error! Element value should be 1 and not %d\n",
value);
num_errs++;
return -1;
}
value += 10;
H5Dwrite(dataset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT,
&value);
return 0;
}
/*
* Need to perform the dataset, datatype and dataspace close that was never
* performed because of thread cancellation
*/
void cancellation_cleanup(void *arg)
{
cancel_cleanup_t *cleanup_structure = (cancel_cleanup_t *)arg;
H5Dclose(cleanup_structure->dataset);
H5Tclose(cleanup_structure->datatype);
H5Sclose(cleanup_structure->dataspace);
/* retained for debugging */
/* print_func("cancellation noted, cleaning up ... \n"); */
}
/*
* Artificial (and specific to this test) barrier to keep track of whether
* both the main and child threads have reached a point in the program.
*/
void tts_cancel_barrier(void)
{
static int count = 2;
pthread_mutex_lock(&mutex);
if (count != 1) {
count--;
pthread_cond_wait(&cond, &mutex);
} else {
pthread_cond_signal(&cond);
}
pthread_mutex_unlock(&mutex);
}
void cleanup_cancel(void)
{
HDunlink(FILENAME);
}
#endif /*H5_HAVE_THREADSAFE*/
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