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Detach a message range
#include <sys/iofunc.h>
#include <sys/dispatch.h>
int message_detach( dispatch_t * dpp,
int low,
int high,
int flags );
- dpp
- The dispatch handle, as returned by
dispatch_create().
- low, high
- The range of messages that you want to detach the handler from.
This range must be the same one that you passed to
message_attach().
- flags
- Reserved.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The message_detach() function
detaches the message type [low, high],
for dispatch handle dpp, that was attached with
message_attach().
Zero on success. If an error occurs, -1 or the following error constant:
- EINVAL
- The range [low, high] doesn't match the range
that you attached with
message_attach().
#include <sys/dispatch.h>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
int my_func( … ) {
…
}
int main( int argc, char **argv ) {
dispatch_t *dpp;
int lo=0x2000, hi=0x2fff, flags=0;
if( ( dpp = dispatch_create() ) == NULL ) {
fprintf( stderr,
"%s: Unable to allocate dispatch handle.\n",
argv[0] );
return EXIT_FAILURE;
}
…
if( message_attach( dpp, NULL, lo, hi,
&my_func, NULL) == -1 ) {
fprintf( stderr,
"%s: Failed to attach message range.\n",
argv[0] );
return 1;
}
…
if ( message_detach ( dpp, lo, hi, flags ) == -1 ) {
fprintf ( stderr,
"Failed to detach message range from %d to %d.\n",
lo, hi );
return 1;
}
/* else message was detached */
…
}
For examples using the dispatch interface, see
dispatch_create(),
message_attach(),
resmgr_attach(), and
thread_pool_create().
QNX Neutrino
Safety: | |
Cancellation point |
Yes |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |
message_attach()
“Layers in a resource manager”
in the Bones of a Resource Manager chapter of Writing a Resource Manager
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