| 1 | /*
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| 2 | * Copyright (C) 2006 Ondrej Palkovsky
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | ipc_wait_t call_func(args)
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| 30 | {
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| 31 | }
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| 32 |
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| 33 | ipc_wait_t fire_function(args)
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| 34 | {
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| 35 | stack = malloc(stacksize);
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| 36 | setup(stack);
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| 37 | add_to_list_of_ready_funcs(stack);
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| 38 | if (threads_waiting_for_message)
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| 39 | send_message_to_self_to_one_up();
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| 40 | }
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| 41 |
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| 42 | void discard_result(ipc_wait_t funcid)
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| 43 | {
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| 44 | }
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| 45 |
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| 46 | int wait_result(ipc_wait_t funcid);
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| 47 | {
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| 48 | save_context(self);
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| 49 | restart:
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| 50 | if result_available() {
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| 51 | if in_list_of_ready(self):
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| 52 | tear_off_list(self);
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| 53 | return retval;
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| 54 | }
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| 55 | add_to_waitlist_of(funcid);
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| 56 |
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| 57 | take_something_from_list_of_ready();
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| 58 | if something {
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| 59 |
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| 60 | restore_context(something);
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| 61 | } else { /* nothing */
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| 62 | wait_for_call();
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| 63 | if (answer) {
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| 64 | mark_result_ready();
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| 65 | put_waiting_thread_to_waitlist();
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| 66 |
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| 67 | goto restart;
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| 68 | }
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| 69 | }
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| 70 |
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| 71 | }
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| 72 |
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| 73 |
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| 74 | int ipc_call_sync(args)
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| 75 | {
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| 76 | return ipc_wait(call_func(args));
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| 77 | }
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