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47 .TH PTHREAD_ONCE 3C "Mar 23, 2005"
49 pthread_once \- initialize dynamic package
53 cc -mt [ \fIflag\fR... ] \fIfile\fR... -lpthread [ \fIlibrary\fR... ]
56 \fBpthread_once_t\fR \fIonce_control\fR = \fBPTHREAD_ONCE_INIT\fR;
58 \fBint\fR \fBpthread_once\fR(\fBpthread_once_t *\fR\fIonce_control\fR,
59 \fBvoid (*\fR\fIinit_routine\fR)(\fBvoid\fR));
65 If any thread in a process with a \fIonce_control\fR parameter makes a call to
66 \fBpthread_once()\fR, the first call will summon the \fBinit_routine()\fR, but
67 subsequent calls will not. The \fIonce_control\fR parameter determines whether
68 the associated initialization routine has been called. The \fBinit_routine()\fR
69 is complete upon return of \fBpthread_once()\fR.
72 \fBpthread_once()\fR is not a cancellation point; however, if the function
73 \fBinit_routine()\fR is a cancellation point and is canceled, the effect on
74 \fIonce_control\fR is the same as if \fBpthread_once()\fR had never been
78 The constant \fBPTHREAD_ONCE_INIT\fR is defined in the \fB<pthread.h>\fR
82 If \fIonce_control\fR has automatic storage duration or is not initialized by
83 \fBPTHREAD_ONCE_INIT\fR, the behavior of \fBpthread_once()\fR is undefined.
87 Upon successful completion, \fBpthread_once()\fR returns \fB0\fR. Otherwise, an
88 error number is returned to indicate the error.
96 \fIonce_control\fR or \fIinit_routine\fR is \fINULL\fR.
102 See \fBattributes\fR(5) for descriptions of the following attributes:
110 ATTRIBUTE TYPE ATTRIBUTE VALUE
112 Interface Stability Standard
120 \fBattributes\fR(5), \fBstandards\fR(5)
124 Solaris threads do not offer this functionality.