| 1 | .rn '' }` |
| 2 | ''' $RCSfile$$Revision$$Date$ |
| 3 | ''' |
| 4 | ''' $Log$ |
| 5 | ''' |
| 6 | .de Sh |
| 7 | .br |
| 8 | .if t .Sp |
| 9 | .ne 5 |
| 10 | .PP |
| 11 | \fB\\$1\fR |
| 12 | .PP |
| 13 | .. |
| 14 | .de Sp |
| 15 | .if t .sp .5v |
| 16 | .if n .sp |
| 17 | .. |
| 18 | .de Ip |
| 19 | .br |
| 20 | .ie \\n(.$>=3 .ne \\$3 |
| 21 | .el .ne 3 |
| 22 | .IP "\\$1" \\$2 |
| 23 | .. |
| 24 | .de Vb |
| 25 | .ft CW |
| 26 | .nf |
| 27 | .ne \\$1 |
| 28 | .. |
| 29 | .de Ve |
| 30 | .ft R |
| 31 | |
| 32 | .fi |
| 33 | .. |
| 34 | ''' |
| 35 | ''' |
| 36 | ''' Set up \*(-- to give an unbreakable dash; |
| 37 | ''' string Tr holds user defined translation string. |
| 38 | ''' Bell System Logo is used as a dummy character. |
| 39 | ''' |
| 40 | .tr \(*W-|\(bv\*(Tr |
| 41 | .ie n \{\ |
| 42 | .ds -- \(*W- |
| 43 | .ds PI pi |
| 44 | .if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch |
| 45 | .if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch |
| 46 | .ds L" "" |
| 47 | .ds R" "" |
| 48 | ''' \*(M", \*(S", \*(N" and \*(T" are the equivalent of |
| 49 | ''' \*(L" and \*(R", except that they are used on ".xx" lines, |
| 50 | ''' such as .IP and .SH, which do another additional levels of |
| 51 | ''' double-quote interpretation |
| 52 | .ds M" """ |
| 53 | .ds S" """ |
| 54 | .ds N" """"" |
| 55 | .ds T" """"" |
| 56 | .ds L' ' |
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| 60 | .ds N' ' |
| 61 | .ds T' ' |
| 62 | 'br\} |
| 63 | .el\{\ |
| 64 | .ds -- \(em\| |
| 65 | .tr \*(Tr |
| 66 | .ds L" `` |
| 67 | .ds R" '' |
| 68 | .ds M" `` |
| 69 | .ds S" '' |
| 70 | .ds N" `` |
| 71 | .ds T" '' |
| 72 | .ds L' ` |
| 73 | .ds R' ' |
| 74 | .ds M' ` |
| 75 | .ds S' ' |
| 76 | .ds N' ` |
| 77 | .ds T' ' |
| 78 | .ds PI \(*p |
| 79 | 'br\} |
| 80 | .\" If the F register is turned on, we'll generate |
| 81 | .\" index entries out stderr for the following things: |
| 82 | .\" TH Title |
| 83 | .\" SH Header |
| 84 | .\" Sh Subsection |
| 85 | .\" Ip Item |
| 86 | .\" X<> Xref (embedded |
| 87 | .\" Of course, you have to process the output yourself |
| 88 | .\" in some meaninful fashion. |
| 89 | .if \nF \{ |
| 90 | .de IX |
| 91 | .tm Index:\\$1\t\\n%\t"\\$2" |
| 92 | .. |
| 93 | .nr % 0 |
| 94 | .rr F |
| 95 | .\} |
| 96 | .TH threads 3 "0.9.7d" "2/Sep/2004" "OpenSSL" |
| 97 | .UC |
| 98 | .if n .hy 0 |
| 99 | .if n .na |
| 100 | .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' |
| 101 | .de CQ \" put $1 in typewriter font |
| 102 | .ft CW |
| 103 | 'if n "\c |
| 104 | 'if t \\&\\$1\c |
| 105 | 'if n \\&\\$1\c |
| 106 | 'if n \&" |
| 107 | \\&\\$2 \\$3 \\$4 \\$5 \\$6 \\$7 |
| 108 | '.ft R |
| 109 | .. |
| 110 | .\" @(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2 |
| 111 | . \" AM - accent mark definitions |
| 112 | .bd B 3 |
| 113 | . \" fudge factors for nroff and troff |
| 114 | .if n \{\ |
| 115 | . ds #H 0 |
| 116 | . ds #V .8m |
| 117 | . ds #F .3m |
| 118 | . ds #[ \f1 |
| 119 | . ds #] \fP |
| 120 | .\} |
| 121 | .if t \{\ |
| 122 | . ds #H ((1u-(\\\\n(.fu%2u))*.13m) |
| 123 | . ds #V .6m |
| 124 | . ds #F 0 |
| 125 | . ds #[ \& |
| 126 | . ds #] \& |
| 127 | .\} |
| 128 | . \" simple accents for nroff and troff |
| 129 | .if n \{\ |
| 130 | . ds ' \& |
| 131 | . ds ` \& |
| 132 | . ds ^ \& |
| 133 | . ds , \& |
| 134 | . ds ~ ~ |
| 135 | . ds ? ? |
| 136 | . ds ! ! |
| 137 | . ds / |
| 138 | . ds q |
| 139 | .\} |
| 140 | .if t \{\ |
| 141 | . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" |
| 142 | . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' |
| 143 | . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' |
| 144 | . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' |
| 145 | . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' |
| 146 | . ds ? \s-2c\h'-\w'c'u*7/10'\u\h'\*(#H'\zi\d\s+2\h'\w'c'u*8/10' |
| 147 | . ds ! \s-2\(or\s+2\h'-\w'\(or'u'\v'-.8m'.\v'.8m' |
| 148 | . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' |
| 149 | . ds q o\h'-\w'o'u*8/10'\s-4\v'.4m'\z\(*i\v'-.4m'\s+4\h'\w'o'u*8/10' |
| 150 | .\} |
| 151 | . \" troff and (daisy-wheel) nroff accents |
| 152 | .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V' |
| 153 | .ds 8 \h'\*(#H'\(*b\h'-\*(#H' |
| 154 | .ds v \\k:\h'-(\\n(.wu*9/10-\*(#H)'\v'-\*(#V'\*(#[\s-4v\s0\v'\*(#V'\h'|\\n:u'\*(#] |
| 155 | .ds _ \\k:\h'-(\\n(.wu*9/10-\*(#H+(\*(#F*2/3))'\v'-.4m'\z\(hy\v'.4m'\h'|\\n:u' |
| 156 | .ds . \\k:\h'-(\\n(.wu*8/10)'\v'\*(#V*4/10'\z.\v'-\*(#V*4/10'\h'|\\n:u' |
| 157 | .ds 3 \*(#[\v'.2m'\s-2\&3\s0\v'-.2m'\*(#] |
| 158 | .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#] |
| 159 | .ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H' |
| 160 | .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u' |
| 161 | .ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#] |
| 162 | .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#] |
| 163 | .ds ae a\h'-(\w'a'u*4/10)'e |
| 164 | .ds Ae A\h'-(\w'A'u*4/10)'E |
| 165 | .ds oe o\h'-(\w'o'u*4/10)'e |
| 166 | .ds Oe O\h'-(\w'O'u*4/10)'E |
| 167 | . \" corrections for vroff |
| 168 | .if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u' |
| 169 | .if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u' |
| 170 | . \" for low resolution devices (crt and lpr) |
| 171 | .if \n(.H>23 .if \n(.V>19 \ |
| 172 | \{\ |
| 173 | . ds : e |
| 174 | . ds 8 ss |
| 175 | . ds v \h'-1'\o'\(aa\(ga' |
| 176 | . ds _ \h'-1'^ |
| 177 | . ds . \h'-1'. |
| 178 | . ds 3 3 |
| 179 | . ds o a |
| 180 | . ds d- d\h'-1'\(ga |
| 181 | . ds D- D\h'-1'\(hy |
| 182 | . ds th \o'bp' |
| 183 | . ds Th \o'LP' |
| 184 | . ds ae ae |
| 185 | . ds Ae AE |
| 186 | . ds oe oe |
| 187 | . ds Oe OE |
| 188 | .\} |
| 189 | .rm #[ #] #H #V #F C |
| 190 | .SH "NAME" |
| 191 | CRYPTO_set_locking_callback, CRYPTO_set_id_callback, CRYPTO_num_locks, |
| 192 | CRYPTO_set_dynlock_create_callback, CRYPTO_set_dynlock_lock_callback, |
| 193 | CRYPTO_set_dynlock_destroy_callback, CRYPTO_get_new_dynlockid, |
| 194 | CRYPTO_destroy_dynlockid, CRYPTO_lock \- OpenSSL thread support |
| 195 | .SH "SYNOPSIS" |
| 196 | .PP |
| 197 | .Vb 1 |
| 198 | \& #include <openssl/crypto.h> |
| 199 | .Ve |
| 200 | .Vb 2 |
| 201 | \& void CRYPTO_set_locking_callback(void (*locking_function)(int mode, |
| 202 | \& int n, const char *file, int line)); |
| 203 | .Ve |
| 204 | .Vb 1 |
| 205 | \& void CRYPTO_set_id_callback(unsigned long (*id_function)(void)); |
| 206 | .Ve |
| 207 | .Vb 1 |
| 208 | \& int CRYPTO_num_locks(void); |
| 209 | .Ve |
| 210 | .Vb 2 |
| 211 | \& /* struct CRYPTO_dynlock_value needs to be defined by the user */ |
| 212 | \& struct CRYPTO_dynlock_value; |
| 213 | .Ve |
| 214 | .Vb 7 |
| 215 | \& void CRYPTO_set_dynlock_create_callback(struct CRYPTO_dynlock_value * |
| 216 | \& (*dyn_create_function)(char *file, int line)); |
| 217 | \& void CRYPTO_set_dynlock_lock_callback(void (*dyn_lock_function) |
| 218 | \& (int mode, struct CRYPTO_dynlock_value *l, |
| 219 | \& const char *file, int line)); |
| 220 | \& void CRYPTO_set_dynlock_destroy_callback(void (*dyn_destroy_function) |
| 221 | \& (struct CRYPTO_dynlock_value *l, const char *file, int line)); |
| 222 | .Ve |
| 223 | .Vb 1 |
| 224 | \& int CRYPTO_get_new_dynlockid(void); |
| 225 | .Ve |
| 226 | .Vb 1 |
| 227 | \& void CRYPTO_destroy_dynlockid(int i); |
| 228 | .Ve |
| 229 | .Vb 1 |
| 230 | \& void CRYPTO_lock(int mode, int n, const char *file, int line); |
| 231 | .Ve |
| 232 | .Vb 10 |
| 233 | \& #define CRYPTO_w_lock(type) \e |
| 234 | \& CRYPTO_lock(CRYPTO_LOCK|CRYPTO_WRITE,type,__FILE__,__LINE__) |
| 235 | \& #define CRYPTO_w_unlock(type) \e |
| 236 | \& CRYPTO_lock(CRYPTO_UNLOCK|CRYPTO_WRITE,type,__FILE__,__LINE__) |
| 237 | \& #define CRYPTO_r_lock(type) \e |
| 238 | \& CRYPTO_lock(CRYPTO_LOCK|CRYPTO_READ,type,__FILE__,__LINE__) |
| 239 | \& #define CRYPTO_r_unlock(type) \e |
| 240 | \& CRYPTO_lock(CRYPTO_UNLOCK|CRYPTO_READ,type,__FILE__,__LINE__) |
| 241 | \& #define CRYPTO_add(addr,amount,type) \e |
| 242 | \& CRYPTO_add_lock(addr,amount,type,__FILE__,__LINE__) |
| 243 | .Ve |
| 244 | .SH "DESCRIPTION" |
| 245 | OpenSSL can safely be used in multi-threaded applications provided |
| 246 | that at least two callback functions are set. |
| 247 | .PP |
| 248 | \fIlocking_function\fR\|(int mode, int n, const char *file, int line) is |
| 249 | needed to perform locking on shared data structures. |
| 250 | (Note that OpenSSL uses a number of global data structures that |
| 251 | will be implicitly shared whenever multiple threads use OpenSSL.) |
| 252 | Multi-threaded applications will crash at random if it is not set. |
| 253 | .PP |
| 254 | \fIlocking_function()\fR must be able to handle up to \fICRYPTO_num_locks()\fR |
| 255 | different mutex locks. It sets the \fBn\fR\-th lock if \fBmode\fR & |
| 256 | \fBCRYPTO_LOCK\fR, and releases it otherwise. |
| 257 | .PP |
| 258 | \fBfile\fR and \fBline\fR are the file number of the function setting the |
| 259 | lock. They can be useful for debugging. |
| 260 | .PP |
| 261 | \fIid_function\fR\|(void) is a function that returns a thread ID. It is not |
| 262 | needed on Windows nor on platforms where \fIgetpid()\fR returns a different |
| 263 | ID for each thread (most notably Linux). |
| 264 | .PP |
| 265 | Additionally, OpenSSL supports dynamic locks, and sometimes, some parts |
| 266 | of OpenSSL need it for better performance. To enable this, the following |
| 267 | is required: |
| 268 | .Ip "\(bu Three additional callback function, dyn_create_function, dyn_lock_function and dyn_destroy_function." 4 |
| 269 | .Ip "\(bu A structure defined with the data that each lock needs to handle." 4 |
| 270 | .PP |
| 271 | struct CRYPTO_dynlock_value has to be defined to contain whatever structure |
| 272 | is needed to handle locks. |
| 273 | .PP |
| 274 | \fIdyn_create_function\fR\|(const char *file, int line) is needed to create a |
| 275 | lock. Multi-threaded applications might crash at random if it is not set. |
| 276 | .PP |
| 277 | \fIdyn_lock_function\fR\|(int mode, CRYPTO_dynlock *l, const char *file, int line) |
| 278 | is needed to perform locking off dynamic lock numbered n. Multi-threaded |
| 279 | applications might crash at random if it is not set. |
| 280 | .PP |
| 281 | \fIdyn_destroy_function\fR\|(CRYPTO_dynlock *l, const char *file, int line) is |
| 282 | needed to destroy the lock l. Multi-threaded applications might crash at |
| 283 | random if it is not set. |
| 284 | .PP |
| 285 | \fICRYPTO_get_new_dynlockid()\fR is used to create locks. It will call |
| 286 | dyn_create_function for the actual creation. |
| 287 | .PP |
| 288 | \fICRYPTO_destroy_dynlockid()\fR is used to destroy locks. It will call |
| 289 | dyn_destroy_function for the actual destruction. |
| 290 | .PP |
| 291 | \fICRYPTO_lock()\fR is used to lock and unlock the locks. mode is a bitfield |
| 292 | describing what should be done with the lock. n is the number of the |
| 293 | lock as returned from \fICRYPTO_get_new_dynlockid()\fR. mode can be combined |
| 294 | from the following values. These values are pairwise exclusive, with |
| 295 | undefined behaviour if misused (for example, \s-1CRYPTO_READ\s0 and \s-1CRYPTO_WRITE\s0 |
| 296 | should not be used together): |
| 297 | .PP |
| 298 | .Vb 4 |
| 299 | \& CRYPTO_LOCK 0x01 |
| 300 | \& CRYPTO_UNLOCK 0x02 |
| 301 | \& CRYPTO_READ 0x04 |
| 302 | \& CRYPTO_WRITE 0x08 |
| 303 | .Ve |
| 304 | .SH "RETURN VALUES" |
| 305 | \fICRYPTO_num_locks()\fR returns the required number of locks. |
| 306 | .PP |
| 307 | \fICRYPTO_get_new_dynlockid()\fR returns the index to the newly created lock. |
| 308 | .PP |
| 309 | The other functions return no values. |
| 310 | .SH "NOTE" |
| 311 | You can find out if OpenSSL was configured with thread support: |
| 312 | .PP |
| 313 | .Vb 7 |
| 314 | \& #define OPENSSL_THREAD_DEFINES |
| 315 | \& #include <openssl/opensslconf.h> |
| 316 | \& #if defined(THREADS) |
| 317 | \& // thread support enabled |
| 318 | \& #else |
| 319 | \& // no thread support |
| 320 | \& #endif |
| 321 | .Ve |
| 322 | Also, dynamic locks are currently not used internally by OpenSSL, but |
| 323 | may do so in the future. |
| 324 | .SH "EXAMPLES" |
| 325 | \fBcrypto/threads/mttest.c\fR shows examples of the callback functions on |
| 326 | Solaris, Irix and Win32. |
| 327 | .SH "HISTORY" |
| 328 | \fICRYPTO_set_locking_callback()\fR and \fICRYPTO_set_id_callback()\fR are |
| 329 | available in all versions of SSLeay and OpenSSL. |
| 330 | \fICRYPTO_num_locks()\fR was added in OpenSSL 0.9.4. |
| 331 | All functions dealing with dynamic locks were added in OpenSSL 0.9.5b-dev. |
| 332 | .SH "SEE ALSO" |
| 333 | crypto(3) |
| 334 | |
| 335 | .rn }` '' |
| 336 | .IX Title "threads 3" |
| 337 | .IX Name "CRYPTO_set_locking_callback, CRYPTO_set_id_callback, CRYPTO_num_locks, |
| 338 | CRYPTO_set_dynlock_create_callback, CRYPTO_set_dynlock_lock_callback, |
| 339 | CRYPTO_set_dynlock_destroy_callback, CRYPTO_get_new_dynlockid, |
| 340 | CRYPTO_destroy_dynlockid, CRYPTO_lock - OpenSSL thread support" |
| 341 | |
| 342 | .IX Header "NAME" |
| 343 | |
| 344 | .IX Header "SYNOPSIS" |
| 345 | |
| 346 | .IX Header "DESCRIPTION" |
| 347 | |
| 348 | .IX Item "\(bu Three additional callback function, dyn_create_function, dyn_lock_function and dyn_destroy_function." |
| 349 | |
| 350 | .IX Item "\(bu A structure defined with the data that each lock needs to handle." |
| 351 | |
| 352 | .IX Header "RETURN VALUES" |
| 353 | |
| 354 | .IX Header "NOTE" |
| 355 | |
| 356 | .IX Header "EXAMPLES" |
| 357 | |
| 358 | .IX Header "HISTORY" |
| 359 | |
| 360 | .IX Header "SEE ALSO" |
| 361 | |