source: mainline/uspace/lib/c/include/ipc/common.h@ c62a8275

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since c62a8275 was 1c635d6, checked in by Martin Sucha <sucha14@…>, 11 years ago

Do not hold a task's return value after it has disconnected.

Holding the task's return value meant that if nobody waited
for task's result, it polluted NS's memory. This was apparently
done because of a race between spawning a task and waiting for it.

We solve this problem in another way: ns discards the return value
as soon as the task disconnects from it. This typically happens
when the task finishes its execution. In order to avoid the race,
we send the wait request to ns while spawning the task (i.e. when
we talk to the loader), but before we allow the loaded program
to run.

Fixes #132

  • Property mode set to 100644
File size: 1.8 KB
Line 
1/*
2 * Copyright (c) 2011 Martin Decky
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup libcipc
30 * @{
31 */
32/** @file
33 */
34
35#ifndef LIBC_IPC_COMMON_H_
36#define LIBC_IPC_COMMON_H_
37
38#include <sys/types.h>
39#include <abi/ipc/ipc.h>
40#include <atomic.h>
41#include <abi/proc/task.h>
42
43#define IPC_FLAG_BLOCKING 0x01
44
45typedef struct {
46 sysarg_t args[IPC_CALL_LEN];
47 task_id_t in_task_id;
48 sysarg_t in_phone_hash;
49} ipc_call_t;
50
51typedef sysarg_t ipc_callid_t;
52
53extern atomic_t async_futex;
54
55#endif
56
57/** @}
58 */
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