Acquire a lock on the given image on a scalar locking variable or for the given array element for an array-valued variable. If the aquired_lock is
NULL, the function returns after having obtained the lock. If it is non-
NULL, then acquired_lock is assigned the value true (one) when the lock could be obtained and false (zero) otherwise. Locking a lock variable which has already been locked by the same image is an error.
void _gfortran_caf_lock (caf_token_t token, size_t index, int image_index,
int *aquired_lock, int *stat, char *errmsg, size_t errmsg_len)
|token||intent(in) An opaque pointer identifying the coarray.|
|index||intent(in) Array index; first array index is 0. For scalars, it is always 0.|
|image_index||intent(in) The ID of the remote image; must be a positive number.|
|aquired_lock||intent(out) If not NULL, it returns whether lock could be obtained.|
|stat||intent(out) Stores the STAT=; may be NULL.|
|errmsg||intent(out) When an error occurs, this will be set to an error message; may be NULL.|
|errmsg_len||intent(in) the buffer size of errmsg|
This function is also called for critical blocks; for those, the array index is always zero and the image index is one. Libraries are permitted to use other images for critical-block locking variables.
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Licensed under the GNU Free Documentation License, Version 1.3.