| .TH IM_CONCURRENCY 3 "8 January 2007" |
| .SH NAME |
| im_concurrency_set, im_concurrency_get \- set and get the number of threads to |
| use for evaluation |
| .SH SYNOPSIS |
| .B #include <vips/vips.h> |
| |
| void im_concurrency_set( int concurrency ) |
| .br |
| int im_concurrency_get( void ) |
| |
| .SH DESCRIPTION |
| |
| .B im_concurrency_set(3) |
| and |
| .B im_concurrency_get(3) |
| set and get the number of parallel threads VIPS should use to calculate |
| pixels. |
| |
| A value of zero (the default) means to get the number of threads |
| from the environment variable IM_CONCURRENCY. If that is not set, the number |
| of threads defaults to one. |
| |
| Setting the number of threads only affects image evaluations which start after |
| that point, it will not change the behaviour of existing evaluations. |
| |
| Most command-line vips programs support the --vips-concurrency flag, which can |
| also be used to set the concurrency. |
| |
| .SH SEE ALSO |
| im_get_option_group(3), |
| `VIPS manual,' in accompanying documentation. |
