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annotate nspr/pr/include/pripcsem.h @ 4:b513267f632f tip

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Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2 /* This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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5
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6 /*
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7 * File: pripcsem.h
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8 *
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9 * Description: named semaphores for interprocess
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10 * synchronization
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11 *
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12 * Unrelated processes obtain access to a shared semaphore
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13 * by specifying its name.
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14 *
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15 * Our goal is to support named semaphores on at least
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16 * Unix and Win32 platforms. The implementation will use
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17 * one of the three native semaphore APIs: POSIX, System V,
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18 * and Win32.
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19 *
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20 * Because POSIX named semaphores have kernel persistence,
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21 * we are forced to have a delete function in this API.
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22 */
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23
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24 #ifndef pripcsem_h___
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25 #define pripcsem_h___
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26
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27 #include "prtypes.h"
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28 #include "prio.h"
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29
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30 PR_BEGIN_EXTERN_C
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31
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32 /*
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33 * PRSem is an opaque structure that represents a named
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34 * semaphore.
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35 */
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36 typedef struct PRSem PRSem;
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37
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38 /*
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39 * PR_OpenSemaphore --
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40 *
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41 * Create or open a named semaphore with the specified name.
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42 * A handle to the semaphore is returned.
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43 *
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44 * If the named semaphore doesn't exist and the PR_SEM_CREATE
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45 * flag is specified, the named semaphore is created. The
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46 * created semaphore needs to be removed from the system with
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47 * a PR_DeleteSemaphore call.
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48 *
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49 * If PR_SEM_CREATE is specified, the third argument is the
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50 * access permission bits of the new semaphore (same
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51 * interpretation as the mode argument to PR_Open) and the
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52 * fourth argument is the initial value of the new semaphore.
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53 * If PR_SEM_CREATE is not specified, the third and fourth
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54 * arguments are ignored.
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55 */
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56
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57 #define PR_SEM_CREATE 0x1 /* create if not exist */
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58 #define PR_SEM_EXCL 0x2 /* fail if already exists */
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59
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60 NSPR_API(PRSem *) PR_OpenSemaphore(
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61 const char *name, PRIntn flags, PRIntn mode, PRUintn value);
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62
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63 /*
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64 * PR_WaitSemaphore --
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65 *
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66 * If the value of the semaphore is > 0, decrement the value and return.
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67 * If the value is 0, sleep until the value becomes > 0, then decrement
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68 * the value and return.
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69 *
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70 * The "test and decrement" operation is performed atomically.
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71 */
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72
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73 NSPR_API(PRStatus) PR_WaitSemaphore(PRSem *sem);
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74
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75 /*
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76 * PR_PostSemaphore --
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77 *
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78 * Increment the value of the named semaphore by 1.
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79 */
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80
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81 NSPR_API(PRStatus) PR_PostSemaphore(PRSem *sem);
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82
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83 /*
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84 * PR_CloseSemaphore --
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85 *
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86 * Close a named semaphore handle.
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87 */
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88
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89 NSPR_API(PRStatus) PR_CloseSemaphore(PRSem *sem);
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90
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91 /*
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92 * PR_DeleteSemaphore --
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93 *
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94 * Remove a named semaphore from the system.
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95 */
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96
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97 NSPR_API(PRStatus) PR_DeleteSemaphore(const char *name);
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98
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99 PR_END_EXTERN_C
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100
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101 #endif /* pripcsem_h___ */
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