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/GNU Fortran 7

8.2.34 _gfortran_caf_co_min — Collective minimum reduction

Description:

Calculates for each array element of the variable a the minimum value for that element in the current team; if result_image has the value 0, the result shall be stored on all images, otherwise, only on the specified image. This function operates on numeric values and character strings.

Syntax:

void _gfortran_caf_co_min (gfc_descriptor_t *a, int result_image, int *stat, char *errmsg, int a_len, int errmsg_len)

Arguments:
a intent(inout) An array descriptor for the data to be processed. On the destination image(s) the result overwrites the old content.
result_image intent(in) The ID of the image to which the reduced value should be copied to; if zero, it has to be copied to all images.
stat intent(out) Stores the status STAT= and may be NULL.
errmsg intent(out) When an error occurs, this will be set to an error message; may be NULL.
a_len intent(in) the string length of argument a
errmsg_len intent(in) the buffer size of errmsg
NOTES

If result_image is nonzero, the data in the array descriptor a on all images except of the specified one become undefined; hence, the library may make use of this.

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https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gfortran/_005fgfortran_005fcaf_005fco_005fmin.html