70 lines
2.8 KiB
Groff
70 lines
2.8 KiB
Groff
.TH "evthread_condition_callbacks" 3 "Wed Apr 10 2013" "libevent" \" -*- nroff -*-
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.ad l
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.nh
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.SH NAME
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evthread_condition_callbacks \-
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.PP
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This structure describes the interface a threading library uses for condition variables\&.
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.SH SYNOPSIS
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.br
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.PP
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.PP
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\fC#include <thread\&.h>\fP
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.SS "Data Fields"
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.in +1c
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.ti -1c
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.RI "void *(* \fBalloc_condition\fP )(unsigned condtype)"
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.br
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.RI "\fIFunction to allocate and initialize a new condition variable\&. \fP"
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.ti -1c
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.RI "int \fBcondition_api_version\fP"
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.br
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.RI "\fIThe current version of the conditions API\&. \fP"
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.ti -1c
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.RI "void(* \fBfree_condition\fP )(void *cond)"
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.br
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.RI "\fIFunction to free a condition variable\&. \fP"
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.ti -1c
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.RI "int(* \fBsignal_condition\fP )(void *cond, int broadcast)"
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.br
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.RI "\fIFunction to signal a condition variable\&. \fP"
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.ti -1c
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.RI "int(* \fBwait_condition\fP )(void *cond, void *lock, const struct timeval *timeout)"
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.br
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.RI "\fIFunction to wait for a condition variable\&. \fP"
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.in -1c
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.SH "Detailed Description"
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.PP
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This structure describes the interface a threading library uses for condition variables\&.
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It's used to tell evthread_set_condition_callbacks how to use locking on this platform\&.
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.SH "Field Documentation"
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.PP
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.SS "void*(* evthread_condition_callbacks::alloc_condition)(unsigned condtype)"
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.PP
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Function to allocate and initialize a new condition variable\&. Returns the condition variable on success, and NULL on failure\&. The 'condtype' argument will be 0 with this API version\&.
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.SS "int evthread_condition_callbacks::condition_api_version"
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.PP
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The current version of the conditions API\&. Set this to EVTHREAD_CONDITION_API_VERSION
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.SS "void(* evthread_condition_callbacks::free_condition)(void *cond)"
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.PP
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Function to free a condition variable\&.
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.SS "int(* evthread_condition_callbacks::signal_condition)(void *cond, int broadcast)"
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.PP
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Function to signal a condition variable\&. If 'broadcast' is 1, all threads waiting on 'cond' should be woken; otherwise, only on one thread is worken\&. Should return 0 on success, -1 on failure\&. This function will only be called while holding the associated lock for the condition\&.
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.SS "int(* evthread_condition_callbacks::wait_condition)(void *cond, void *lock, const struct timeval *timeout)"
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.PP
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Function to wait for a condition variable\&. The lock 'lock' will be held when this function is called; should be released while waiting for the condition to be come signalled, and should be held again when this function returns\&. If timeout is provided, it is interval of seconds to wait for the event to become signalled; if it is NULL, the function should wait indefinitely\&.
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.PP
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The function should return -1 on error; 0 if the condition was signalled, or 1 on a timeout\&.
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.SH "Author"
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.PP
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Generated automatically by Doxygen for libevent from the source code\&.
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