Example Usage:

The example below illustrates the usage of this routine to activate the SWMR writing mode for an opened file.

/*
 *   The writer process
 */
/* Create a copy of the file access property list */
fapl_id = H5Pcreate(H5P_FILE_ACCESS);

/* Set to use the latest library format */
H5Pset_libver_bounds(fapl_id, H5F_LIBVER_LATEST, H5F_LIBVER_LATEST); 

/* Create a file with the latest library format */ 
file_id = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id);
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/* Perform operations that are not SWMR-safe. */
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/* Start a concurrent SWMR reader process (see coding below) at this point 
   will fail because the file is not marked as SWMR-safe */

/* Enable SWMR writing mode */
H5Fstart_swmr_write(file_id);

/* Start a concurrent SWMR reader process (see coding below) at this point 
   will succeed because the file is marked as SWMR-safe */


/* Perform SWMR-safe operations */
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/* Close the file */
H5Fclose(file_id);

/* Close the property list */
H5Pclose(fapl_id);


/*
 *   The SWMR reader process
 */
read_file_id = H5Fopen(filename, H5F_ACC_RDONLY|H5F_ACC_SWMR_READ, fapl_id);

/* Perform reading operations */
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/* Close the file */
H5Fclose(read_file_id);