Block while waiting for a message
#include <sys/iofunc.h> #include <sys/dispatch.h> resmgr_context_t * resmgr_block ( resmgr_context_t * ctp );
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The resmgr_block() function waits for a message (created by a call to resmgr_context_alloc()) for context ctp.
The same pointer as ctp, or NULL if an error occurs (errno is set).
#include <sys/dispatch.h> #include <stdio.h> #include <stdlib.h> int main( int argc, char **argv ) { dispatch_t *dpp; resmgr_context_t *ctp; if ((dpp = dispatch_create()) == NULL) { fprintf( stderr, "%s: Unable to allocate \ dispatch handle.\n",argv[0] ); return EXIT_FAILURE; } … ctp = resmgr_context_alloc( dpp ); while (1) { if ( ( ctp = resmgr_block( ctp )) == NULL ) { fprintf( stderr, "block error\n" ); return EXIT_FAILURE; } resmgr_handler( ctp ); } }
For examples using the dispatch interface, see dispatch_create(), message_attach(), resmgr_attach(), and thread_pool_create().
Safety: | |
---|---|
Cancellation point | Yes |
Interrupt handler | No |
Signal handler | No |
Thread | Yes |
Use resmgr_block() only in a simple resource manager and when you don't use message_attach(), pulse_attach(), or select_attach().