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1/* Copyright (C) 1994-2019 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
17
18/* Declare the few Mach system calls (except mach_msg, in <mach/message.h>).
19 This does not include the kernel RPC shortcut calls (in <mach-shortcuts.h>).
20 */
21
22#ifndef _MACH_MACH_TRAPS_H
23
24#define _MACH_MACH_TRAPS_H_ 1
25
26#include <mach/port.h>
27#include <mach/message.h> /* mach_msg_timeout_t */
28#include <mach/kern_return.h>
29
30/* Create and return a new receive right. */
31extern mach_port_t mach_reply_port (void);
32
33/* Return the thread control port for the calling thread. */
34extern mach_port_t mach_thread_self (void);
35
36/* Return the task control port for the calling task.
37 The parens are needed to protect against the macro in <mach_init.h>. */
38extern mach_port_t (mach_task_self) (void);
39
40/* Return the host information port for the host of the calling task.
41 The parens are needed to protect against the macro in <mach_init.h>. */
42extern mach_port_t (mach_host_self) (void);
43
44/* Attempt to context switch the current thread off the processor. Returns
45 true if there are other threads that can be run and false if not. */
46extern boolean_t swtch (void);
47
48/* Attempt to context switch the current thread off the processor. Lower
49 the thread's priority as much as possible. The thread's priority will
50 be restored when it runs again. PRIORITY is currently unused. Return
51 true if there are other threads that can be run and false if not. */
52extern boolean_t swtch_pri (int priority);
53
54/* Attempt to context switch the current thread off the processor. Try
55 to run NEW_THREAD next, ignoring normal scheduling policies. The
56 OPTION value comes from <mach/thread_switch.h>. If OPTION is
57 SWITCH_OPTION_WAIT, then block the current thread for TIME
58 milliseconds. If OPTION is SWITCH_OPTION_DEPRESS, then block for
59 TIME milliseconds and depress the thread's priority as done by
60 swtch_pri. If OPTION is SWITCH_OPTION_NONE, ignore TIME. */
61kern_return_t thread_switch (mach_port_t new_thread,
62 int option, mach_msg_timeout_t option_time);
63
64/* Block the current thread until the kernel (or device) event
65 identified by EVENT occurs. */
66kern_return_t evc_wait (unsigned int event);
67
68/* Display a null-terminated character string on the Mach console. This
69 system call is meant as a debugging tool useful to circumvent messaging
70 altogether. */
71
72extern void mach_print(const char *s);
73
74#endif /* mach/mach_traps.h */
75

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