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diff --git a/crypto/openssl/doc/crypto/threads.pod b/crypto/openssl/doc/crypto/threads.pod
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-=pod
-
-=head1 NAME
-
-CRYPTO_set_locking_callback, CRYPTO_set_id_callback - OpenSSL thread support
-
-=head1 SYNOPSIS
-
- #include <openssl/crypto.h>
-
- void CRYPTO_set_locking_callback(void (*locking_function)(int mode,
-        int n, const char *file, int line));
-
- void CRYPTO_set_id_callback(unsigned long (*id_function)(void));
-
- int CRYPTO_num_locks(void);
-
-=head1 DESCRIPTION
-
-OpenSSL can safely be used in multi-threaded applications provided
-that two callback functions are set.
-
-locking_function(int mode, int n, const char *file, int line) is
-needed to perform locking on shared data stuctures. Multi-threaded
-applications will crash at random if it is not set.
-
-locking_function() must be able to handle up to CRYPTO_num_locks()
-different mutex locks. It sets the B<n>-th lock if B<mode> &
-B<CRYPTO_LOCK>, and releases it otherwise.
-
-B<file> and B<line> are the file number of the function setting the
-lock. They can be useful for debugging.
-
-id_function(void) is a function that returns a thread ID. It is not
-needed on Windows nor on platforms where getpid() returns a different
-ID for each thread (most notably Linux).
-
-=head1 RETURN VALUES
-
-CRYPTO_num_locks() returns the required number of locks.
-The other functions return no values.
-
-=head1 NOTE
-
-You can find out if OpenSSL was configured with thread support:
-
- #define OPENSSL_THREAD_DEFINES
- #include <openssl/opensslconf.h>
- #if defined(THREADS)
-   // thread support enabled
- #else
-   // no thread support
- #endif
-
-=head1 EXAMPLES
-
-B<crypto/threads/mttest.c> shows examples of the callback functions on
-Solaris, Irix and Win32.
-
-=head1 HISTORY
-
-CRYPTO_set_locking_callback() and CRYPTO_set_id_callback() are
-available in all versions of SSLeay and OpenSSL.
-CRYPTO_num_locks() was added in OpenSSL 0.9.4.
-
-=head1 SEE ALSO
-
-L<crypto(3)|crypto(3)>
-
-=cut