331 lines
12 KiB
Groff
331 lines
12 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "threads 3"
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.TH threads 3 "2015-07-09" "1.0.2d" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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CRYPTO_THREADID_set_callback, CRYPTO_THREADID_get_callback,
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CRYPTO_THREADID_current, CRYPTO_THREADID_cmp, CRYPTO_THREADID_cpy,
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CRYPTO_THREADID_hash, CRYPTO_set_locking_callback, CRYPTO_num_locks,
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CRYPTO_set_dynlock_create_callback, CRYPTO_set_dynlock_lock_callback,
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CRYPTO_set_dynlock_destroy_callback, CRYPTO_get_new_dynlockid,
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CRYPTO_destroy_dynlockid, CRYPTO_lock \- OpenSSL thread support
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/crypto.h>
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\&
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\& /* Don\*(Aqt use this structure directly. */
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\& typedef struct crypto_threadid_st
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\& {
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\& void *ptr;
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\& unsigned long val;
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\& } CRYPTO_THREADID;
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\& /* Only use CRYPTO_THREADID_set_[numeric|pointer]() within callbacks */
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\& void CRYPTO_THREADID_set_numeric(CRYPTO_THREADID *id, unsigned long val);
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\& void CRYPTO_THREADID_set_pointer(CRYPTO_THREADID *id, void *ptr);
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\& int CRYPTO_THREADID_set_callback(void (*threadid_func)(CRYPTO_THREADID *));
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\& void (*CRYPTO_THREADID_get_callback(void))(CRYPTO_THREADID *);
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\& void CRYPTO_THREADID_current(CRYPTO_THREADID *id);
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\& int CRYPTO_THREADID_cmp(const CRYPTO_THREADID *a,
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\& const CRYPTO_THREADID *b);
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\& void CRYPTO_THREADID_cpy(CRYPTO_THREADID *dest,
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\& const CRYPTO_THREADID *src);
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\& unsigned long CRYPTO_THREADID_hash(const CRYPTO_THREADID *id);
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\&
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\& int CRYPTO_num_locks(void);
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\&
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\& /* struct CRYPTO_dynlock_value needs to be defined by the user */
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\& struct CRYPTO_dynlock_value;
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\&
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\& void CRYPTO_set_dynlock_create_callback(struct CRYPTO_dynlock_value *
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\& (*dyn_create_function)(char *file, int line));
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\& void CRYPTO_set_dynlock_lock_callback(void (*dyn_lock_function)
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\& (int mode, struct CRYPTO_dynlock_value *l,
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\& const char *file, int line));
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\& void CRYPTO_set_dynlock_destroy_callback(void (*dyn_destroy_function)
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\& (struct CRYPTO_dynlock_value *l, const char *file, int line));
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\&
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\& int CRYPTO_get_new_dynlockid(void);
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\&
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\& void CRYPTO_destroy_dynlockid(int i);
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\&
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\& void CRYPTO_lock(int mode, int n, const char *file, int line);
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\&
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\& #define CRYPTO_w_lock(type) \e
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\& CRYPTO_lock(CRYPTO_LOCK|CRYPTO_WRITE,type,_\|_FILE_\|_,_\|_LINE_\|_)
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\& #define CRYPTO_w_unlock(type) \e
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\& CRYPTO_lock(CRYPTO_UNLOCK|CRYPTO_WRITE,type,_\|_FILE_\|_,_\|_LINE_\|_)
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\& #define CRYPTO_r_lock(type) \e
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\& CRYPTO_lock(CRYPTO_LOCK|CRYPTO_READ,type,_\|_FILE_\|_,_\|_LINE_\|_)
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\& #define CRYPTO_r_unlock(type) \e
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\& CRYPTO_lock(CRYPTO_UNLOCK|CRYPTO_READ,type,_\|_FILE_\|_,_\|_LINE_\|_)
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\& #define CRYPTO_add(addr,amount,type) \e
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\& CRYPTO_add_lock(addr,amount,type,_\|_FILE_\|_,_\|_LINE_\|_)
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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OpenSSL can safely be used in multi-threaded applications provided
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that at least two callback functions are set, locking_function and
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threadid_func.
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.PP
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locking_function(int mode, int n, const char *file, int line) is
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needed to perform locking on shared data structures.
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(Note that OpenSSL uses a number of global data structures that
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will be implicitly shared whenever multiple threads use OpenSSL.)
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Multi-threaded applications will crash at random if it is not set.
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.PP
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\&\fIlocking_function()\fR must be able to handle up to \fICRYPTO_num_locks()\fR
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different mutex locks. It sets the \fBn\fR\-th lock if \fBmode\fR &
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\&\fB\s-1CRYPTO_LOCK\s0\fR, and releases it otherwise.
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.PP
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\&\fBfile\fR and \fBline\fR are the file number of the function setting the
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lock. They can be useful for debugging.
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.PP
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threadid_func(\s-1CRYPTO_THREADID\s0 *id) is needed to record the currently-executing
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thread's identifier into \fBid\fR. The implementation of this callback should not
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fill in \fBid\fR directly, but should use \fICRYPTO_THREADID_set_numeric()\fR if thread
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IDs are numeric, or \fICRYPTO_THREADID_set_pointer()\fR if they are pointer-based.
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If the application does not register such a callback using
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\&\fICRYPTO_THREADID_set_callback()\fR, then a default implementation is used \- on
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Windows and BeOS this uses the system's default thread identifying APIs, and on
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all other platforms it uses the address of \fBerrno\fR. The latter is satisfactory
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for thread-safety if and only if the platform has a thread-local error number
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facility.
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.PP
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Once \fIthreadid_func()\fR is registered, or if the built-in default implementation is
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to be used;
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.IP "\(bu" 4
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\&\fICRYPTO_THREADID_current()\fR records the currently-executing thread \s-1ID\s0 into the
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given \fBid\fR object.
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.IP "\(bu" 4
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\&\fICRYPTO_THREADID_cmp()\fR compares two thread IDs (returning zero for equality, ie.
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the same semantics as \fImemcmp()\fR).
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.IP "\(bu" 4
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\&\fICRYPTO_THREADID_cpy()\fR duplicates a thread \s-1ID\s0 value,
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.IP "\(bu" 4
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\&\fICRYPTO_THREADID_hash()\fR returns a numeric value usable as a hash-table key. This
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is usually the exact numeric or pointer-based thread \s-1ID\s0 used internally, however
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this also handles the unusual case where pointers are larger than 'long'
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variables and the platform's thread IDs are pointer-based \- in this case, mixing
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is done to attempt to produce a unique numeric value even though it is not as
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wide as the platform's true thread IDs.
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.PP
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Additionally, OpenSSL supports dynamic locks, and sometimes, some parts
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of OpenSSL need it for better performance. To enable this, the following
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is required:
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.IP "\(bu" 4
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Three additional callback function, dyn_create_function, dyn_lock_function
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and dyn_destroy_function.
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.IP "\(bu" 4
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A structure defined with the data that each lock needs to handle.
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.PP
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struct CRYPTO_dynlock_value has to be defined to contain whatever structure
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is needed to handle locks.
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.PP
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dyn_create_function(const char *file, int line) is needed to create a
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lock. Multi-threaded applications might crash at random if it is not set.
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.PP
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dyn_lock_function(int mode, CRYPTO_dynlock *l, const char *file, int line)
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is needed to perform locking off dynamic lock numbered n. Multi-threaded
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applications might crash at random if it is not set.
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.PP
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dyn_destroy_function(CRYPTO_dynlock *l, const char *file, int line) is
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needed to destroy the lock l. Multi-threaded applications might crash at
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random if it is not set.
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.PP
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\&\fICRYPTO_get_new_dynlockid()\fR is used to create locks. It will call
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dyn_create_function for the actual creation.
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.PP
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\&\fICRYPTO_destroy_dynlockid()\fR is used to destroy locks. It will call
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dyn_destroy_function for the actual destruction.
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.PP
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\&\fICRYPTO_lock()\fR is used to lock and unlock the locks. mode is a bitfield
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describing what should be done with the lock. n is the number of the
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lock as returned from \fICRYPTO_get_new_dynlockid()\fR. mode can be combined
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from the following values. These values are pairwise exclusive, with
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undefined behaviour if misused (for example, \s-1CRYPTO_READ\s0 and \s-1CRYPTO_WRITE\s0
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should not be used together):
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.PP
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.Vb 4
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\& CRYPTO_LOCK 0x01
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\& CRYPTO_UNLOCK 0x02
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\& CRYPTO_READ 0x04
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\& CRYPTO_WRITE 0x08
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.Ve
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fICRYPTO_num_locks()\fR returns the required number of locks.
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.PP
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\&\fICRYPTO_get_new_dynlockid()\fR returns the index to the newly created lock.
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.PP
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The other functions return no values.
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.SH "NOTES"
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.IX Header "NOTES"
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You can find out if OpenSSL was configured with thread support:
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.PP
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.Vb 7
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\& #define OPENSSL_THREAD_DEFINES
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\& #include <openssl/opensslconf.h>
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\& #if defined(OPENSSL_THREADS)
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\& // thread support enabled
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\& #else
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\& // no thread support
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\& #endif
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.Ve
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.PP
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Also, dynamic locks are currently not used internally by OpenSSL, but
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may do so in the future.
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.SH "EXAMPLES"
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.IX Header "EXAMPLES"
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\&\fBcrypto/threads/mttest.c\fR shows examples of the callback functions on
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Solaris, Irix and Win32.
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fICRYPTO_set_locking_callback()\fR is
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available in all versions of SSLeay and OpenSSL.
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\&\fICRYPTO_num_locks()\fR was added in OpenSSL 0.9.4.
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All functions dealing with dynamic locks were added in OpenSSL 0.9.5b\-dev.
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\&\fB\s-1CRYPTO_THREADID\s0\fR and associated functions were introduced in OpenSSL 1.0.0
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to replace (actually, deprecate) the previous \fICRYPTO_set_id_callback()\fR,
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\&\fICRYPTO_get_id_callback()\fR, and \fICRYPTO_thread_id()\fR functions which assumed
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thread IDs to always be represented by 'unsigned long'.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIcrypto\fR\|(3)
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