Lines Matching +full:parent +full:- +full:child

1 // SPDX-License-Identifier: GPL-2.0+
3  * Helper functions to sync execution between parent and child processes.
12  * Information in a shared memory location for synchronization between child and
13  * parent.
16 	/* The parent waits on this semaphore. */
19 	/* If true, the child should give up as well. */
22 	/* The child waits on this semaphore. */
25 	/* If true, the parent should give up as well. */
34 			(sync)->child_gave_up = true;			\
45 			(sync)->parent_gave_up = true;			\
53 		if ((x) == -1 && (errno == ENODEV || errno == EINVAL)) { \
54 			(sync)->parent_gave_up = true;			\
64 	ret = sem_init(&sync->sem_parent, 1, 0);  in init_child_sync()
70 	ret = sem_init(&sync->sem_child, 1, 0);  in init_child_sync()
81 	sem_destroy(&sync->sem_parent);  in destroy_child_sync()
82 	sem_destroy(&sync->sem_child);  in destroy_child_sync()
89 	/* Wait until the child prods us. */  in wait_child()
90 	ret = sem_wait(&sync->sem_parent);  in wait_child()
92 		perror("Error waiting for child");  in wait_child()
96 	return sync->child_gave_up;  in wait_child()
103 	/* Unblock the child now. */  in prod_child()
104 	ret = sem_post(&sync->sem_child);  in prod_child()
106 		perror("Error prodding child");  in prod_child()
117 	/* Wait until the parent prods us. */  in wait_parent()
118 	ret = sem_wait(&sync->sem_child);  in wait_parent()
120 		perror("Error waiting for parent");  in wait_parent()
124 	return sync->parent_gave_up;  in wait_parent()
131 	/* Unblock the parent now. */  in prod_parent()
132 	ret = sem_post(&sync->sem_parent);  in prod_parent()
134 		perror("Error prodding parent");  in prod_parent()