Get the runmask attribute from a spawn attributes object
#include <spawn.h> int posix_spawnattr_getrunmask( const posix_spawnattr_t *_Restrict attrp, uint32_t *_Restrict runmask_p);
- A pointer to the spawn attributes object that you want to query.
- A pointer to a location where the routine can store the current runmask.
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The posix_spawnattr_getrunmask() routine retrieves the current value of the runmask attribute from the given spawn attributes object. You must have already initialized the spawn attributes object by calling posix_spawnattr_init() .
This attribute is a bitmask of the processors that the spawned program can run on. Processor numbering starts at 0, with each processor corresponding to a bit in the runmask. For example, a runmask of 0x00000005 indicates that the spawned process is restricted to CPUs 0 and 2. For more information, see the Multicore Processing User's Guide .
This setting takes effect only if the POSIX_SPAWN_EXPLICIT_CPU flag is set; to set this flag, call posix_spawnattr_setxflags() . The default mask is 0xFFFFFFFFU, indicating that the spawned process can run on any processor.
To set the value of this attribute, call posix_spawnattr_setrunmask() .
For more information about spawn attributes, see the entry for posix_spawn() .
- An argument was invalid.