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-.\" ======================================================================
-.\"
-.IX Title "threads 3"
-.TH threads 3 "0.9.7a" "2003-02-19" "OpenSSL"
-.UC
-.SH "NAME"
-CRYPTO_set_locking_callback, CRYPTO_set_id_callback, CRYPTO_num_locks,
-CRYPTO_set_dynlock_create_callback, CRYPTO_set_dynlock_lock_callback,
-CRYPTO_set_dynlock_destroy_callback, CRYPTO_get_new_dynlockid,
-CRYPTO_destroy_dynlockid, CRYPTO_lock \- OpenSSL thread support
-.SH "SYNOPSIS"
-.IX Header "SYNOPSIS"
-.Vb 1
-\& #include <openssl/crypto.h>
-.Ve
-.Vb 2
-\& void CRYPTO_set_locking_callback(void (*locking_function)(int mode,
-\&        int n, const char *file, int line));
-.Ve
-.Vb 1
-\& void CRYPTO_set_id_callback(unsigned long (*id_function)(void));
-.Ve
-.Vb 1
-\& int CRYPTO_num_locks(void);
-.Ve
-.Vb 2
-\& /* struct CRYPTO_dynlock_value needs to be defined by the user */
-\& struct CRYPTO_dynlock_value;
-.Ve
-.Vb 7
-\& void CRYPTO_set_dynlock_create_callback(struct CRYPTO_dynlock_value *
-\&        (*dyn_create_function)(char *file, int line));
-\& void CRYPTO_set_dynlock_lock_callback(void (*dyn_lock_function)
-\&        (int mode, struct CRYPTO_dynlock_value *l,
-\&        const char *file, int line));
-\& void CRYPTO_set_dynlock_destroy_callback(void (*dyn_destroy_function)
-\&        (struct CRYPTO_dynlock_value *l, const char *file, int line));
-.Ve
-.Vb 1
-\& int CRYPTO_get_new_dynlockid(void);
-.Ve
-.Vb 1
-\& void CRYPTO_destroy_dynlockid(int i);
-.Ve
-.Vb 1
-\& void CRYPTO_lock(int mode, int n, const char *file, int line);
-.Ve
-.Vb 10
-\& #define CRYPTO_w_lock(type)    \e
-\&        CRYPTO_lock(CRYPTO_LOCK|CRYPTO_WRITE,type,__FILE__,__LINE__)
-\& #define CRYPTO_w_unlock(type)  \e
-\&        CRYPTO_lock(CRYPTO_UNLOCK|CRYPTO_WRITE,type,__FILE__,__LINE__)
-\& #define CRYPTO_r_lock(type)    \e
-\&        CRYPTO_lock(CRYPTO_LOCK|CRYPTO_READ,type,__FILE__,__LINE__)
-\& #define CRYPTO_r_unlock(type)  \e
-\&        CRYPTO_lock(CRYPTO_UNLOCK|CRYPTO_READ,type,__FILE__,__LINE__)
-\& #define CRYPTO_add(addr,amount,type)   \e
-\&        CRYPTO_add_lock(addr,amount,type,__FILE__,__LINE__)
-.Ve
-.SH "DESCRIPTION"
-.IX Header "DESCRIPTION"
-OpenSSL can safely be used in multi-threaded applications provided
-that at least two callback functions are set.
-.PP
-locking_function(int mode, int n, const char *file, int line) is
-needed to perform locking on shared data structures. 
-(Note that OpenSSL uses a number of global data structures that
-will be implicitly shared whenever multiple threads use OpenSSL.)
-Multi-threaded applications will crash at random if it is not set.
-.PP
-\&\fIlocking_function()\fR must be able to handle up to \fICRYPTO_num_locks()\fR
-different mutex locks. It sets the \fBn\fR\-th lock if \fBmode\fR &
-\&\fB\s-1CRYPTO_LOCK\s0\fR, and releases it otherwise.
-.PP
-\&\fBfile\fR and \fBline\fR are the file number of the function setting the
-lock. They can be useful for debugging.
-.PP
-id_function(void) is a function that returns a thread \s-1ID\s0. It is not
-needed on Windows nor on platforms where \fIgetpid()\fR returns a different
-\&\s-1ID\s0 for each thread (most notably Linux).
-.PP
-Additionally, OpenSSL supports dynamic locks, and sometimes, some parts
-of OpenSSL need it for better performance.  To enable this, the following
-is required:
-.Ip "\(bu Three additional callback function, dyn_create_function, dyn_lock_function and dyn_destroy_function." 4
-.IX Item "Three additional callback function, dyn_create_function, dyn_lock_function and dyn_destroy_function."
-.PD 0
-.Ip "\(bu A structure defined with the data that each lock needs to handle." 4
-.IX Item "A structure defined with the data that each lock needs to handle."
-.PD
-.PP
-struct CRYPTO_dynlock_value has to be defined to contain whatever structure
-is needed to handle locks.
-.PP
-dyn_create_function(const char *file, int line) is needed to create a
-lock.  Multi-threaded applications might crash at random if it is not set.
-.PP
-dyn_lock_function(int mode, CRYPTO_dynlock *l, const char *file, int line)
-is needed to perform locking off dynamic lock numbered n. Multi-threaded
-applications might crash at random if it is not set.
-.PP
-dyn_destroy_function(CRYPTO_dynlock *l, const char *file, int line) is
-needed to destroy the lock l. Multi-threaded applications might crash at
-random if it is not set.
-.PP
-\&\fICRYPTO_get_new_dynlockid()\fR is used to create locks.  It will call
-dyn_create_function for the actual creation.
-.PP
-\&\fICRYPTO_destroy_dynlockid()\fR is used to destroy locks.  It will call
-dyn_destroy_function for the actual destruction.
-.PP
-\&\fICRYPTO_lock()\fR is used to lock and unlock the locks.  mode is a bitfield
-describing what should be done with the lock.  n is the number of the
-lock as returned from \fICRYPTO_get_new_dynlockid()\fR.  mode can be combined
-from the following values.  These values are pairwise exclusive, with
-undefined behaviour if misused (for example, \s-1CRYPTO_READ\s0 and \s-1CRYPTO_WRITE\s0
-should not be used together):
-.PP
-.Vb 4
-\&        CRYPTO_LOCK     0x01
-\&        CRYPTO_UNLOCK   0x02
-\&        CRYPTO_READ     0x04
-\&        CRYPTO_WRITE    0x08
-.Ve
-.SH "RETURN VALUES"
-.IX Header "RETURN VALUES"
-\&\fICRYPTO_num_locks()\fR returns the required number of locks.
-.PP
-\&\fICRYPTO_get_new_dynlockid()\fR returns the index to the newly created lock.
-.PP
-The other functions return no values.
-.SH "NOTE"
-.IX Header "NOTE"
-You can find out if OpenSSL was configured with thread support:
-.PP
-.Vb 7
-\& #define OPENSSL_THREAD_DEFINES
-\& #include <openssl/opensslconf.h>
-\& #if defined(THREADS)
-\&   // thread support enabled
-\& #else
-\&   // no thread support
-\& #endif
-.Ve
-Also, dynamic locks are currently not used internally by OpenSSL, but
-may do so in the future.
-.SH "EXAMPLES"
-.IX Header "EXAMPLES"
-\&\fBcrypto/threads/mttest.c\fR shows examples of the callback functions on
-Solaris, Irix and Win32.
-.SH "HISTORY"
-.IX Header "HISTORY"
-\&\fICRYPTO_set_locking_callback()\fR and \fICRYPTO_set_id_callback()\fR are
-available in all versions of SSLeay and OpenSSL.
-\&\fICRYPTO_num_locks()\fR was added in OpenSSL 0.9.4.
-All functions dealing with dynamic locks were added in OpenSSL 0.9.5b-dev.
-.SH "SEE ALSO"
-.IX Header "SEE ALSO"
-crypto(3)