projects / apple / libpthread.git / blame
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1 | .\" Copyright (c) 1998 Alex Nash |
| 2 | .\" All rights reserved. | |
| 3 | .\" | |
| 4 | .\" Redistribution and use in source and binary forms, with or without | |
| 5 | .\" modification, are permitted provided that the following conditions | |
| 6 | .\" are met: | |
| 7 | .\" 1. Redistributions of source code must retain the above copyright | |
| 8 | .\" notice, this list of conditions and the following disclaimer. | |
| 9 | .\" 2. Redistributions in binary form must reproduce the above copyright | |
| 10 | .\" notice, this list of conditions and the following disclaimer in the | |
| 11 | .\" documentation and/or other materials provided with the distribution. | |
| 12 | .\" | |
| 13 | .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
| 14 | .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 15 | .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 16 | .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
| 17 | .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 18 | .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 19 | .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 20 | .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 21 | .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 22 | .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 23 | .\" SUCH DAMAGE. | |
| 24 | .\" | |
| 2546420a | 25 | .\" $FreeBSD$ |
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26 | .\" |
| 27 | .Dd March 22, 1999 | |
| 28 | .Dt PTHREAD_RWLOCKATTR_GETPSHARED 3 | |
| 29 | .Os | |
| 30 | .Sh NAME | |
| 31 | .Nm pthread_rwlockattr_getpshared | |
| 32 | .Nd get the process shared attribute | |
| 33 | .Sh SYNOPSIS | |
| 34 | .In pthread.h | |
| 35 | .Ft int | |
| 2546420a | 36 | .Fn pthread_rwlockattr_getpshared "const pthread_rwlockattr_t *attr" "int *pshared" |
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37 | .Sh DESCRIPTION |
| 38 | The | |
| 39 | .Fn pthread_rwlockattr_getpshared | |
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40 | function is used to get the process shared setting of a read/write |
| 41 | lock attribute object. | |
| 42 | The setting is returned via | |
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43 | .Fa pshared , |
| 44 | and may be one of two values: | |
| 45 | .Bl -tag -width PTHREAD_PROCESS_PRIVATE | |
| 46 | .It Dv PTHREAD_PROCESS_SHARED | |
| 47 | Any thread of any process that has access to the memory where the | |
| 48 | read/write lock resides can manipulate the lock. | |
| 49 | .It Dv PTHREAD_PROCESS_PRIVATE | |
| 50 | Only threads created within the same process as the thread that | |
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51 | initialized the read/write lock can manipulate the lock. |
| 52 | This is | |
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53 | the default value. |
| 54 | .El | |
| 55 | .Sh RETURN VALUES | |
| 56 | If successful, the | |
| 57 | .Fn pthread_rwlockattr_getpshared | |
| 58 | function will return zero. | |
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59 | Otherwise an error number will be returned |
| 60 | to indicate the error. | |
| 61 | .Sh ERRORS | |
| 62 | The | |
| 63 | .Fn pthread_rwlockattr_getpshared | |
| 64 | function may fail if: | |
| 65 | .Bl -tag -width Er | |
| 66 | .It Bq Er EINVAL | |
| 67 | The value specified by | |
| 68 | .Fa attr | |
| 69 | is invalid. | |
| 70 | .El | |
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71 | .Sh SEE ALSO |
| 72 | .Xr pthread_rwlock_init 3 , | |
| 73 | .Xr pthread_rwlockattr_init 3 , | |
| 74 | .Xr pthread_rwlockattr_setpshared 3 | |
| 75 | .Sh STANDARDS | |
| 76 | The | |
| 77 | .Fn pthread_rwlockattr_getpshared | |
| 78 | function is expected to conform to | |
| 79 | .St -susv2 . | |
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80 | .Sh HISTORY |
| 81 | The | |
| 82 | .Fn pthread_rwlockattr_getpshared | |
| 83 | function first appeared in | |
| 84 | .Fx 3.0 . |