[65f6d3c] | 1 | /** |
---|
| 2 | * @file |
---|
| 3 | * |
---|
| 4 | * @brief Function Starts a New Thread in The Calling Process |
---|
[5cb175bb] | 5 | * @ingroup POSIXAPI |
---|
[65f6d3c] | 6 | */ |
---|
| 7 | |
---|
[03598b1] | 8 | /* |
---|
| 9 | * 16.1.2 Thread Creation, P1003.1c/Draft 10, p. 144 |
---|
[412dbff6] | 10 | */ |
---|
| 11 | |
---|
[68c156a] | 12 | /* |
---|
| 13 | * COPYRIGHT (c) 1989-2014. |
---|
[03598b1] | 14 | * On-Line Applications Research Corporation (OAR). |
---|
| 15 | * |
---|
| 16 | * The license and distribution terms for this file may be |
---|
| 17 | * found in the file LICENSE in this distribution or at |
---|
[c499856] | 18 | * http://www.rtems.org/license/LICENSE. |
---|
[03598b1] | 19 | */ |
---|
| 20 | |
---|
[f42b726] | 21 | #if HAVE_CONFIG_H |
---|
| 22 | #include "config.h" |
---|
| 23 | #endif |
---|
| 24 | |
---|
[03598b1] | 25 | #include <pthread.h> |
---|
| 26 | #include <errno.h> |
---|
| 27 | |
---|
[97552c98] | 28 | #include <rtems/posix/priorityimpl.h> |
---|
[5618c37a] | 29 | #include <rtems/posix/pthreadimpl.h> |
---|
[51e008dd] | 30 | #include <rtems/score/assert.h> |
---|
[185e46f] | 31 | #include <rtems/score/cpusetimpl.h> |
---|
[5618c37a] | 32 | #include <rtems/score/threadimpl.h> |
---|
[5088d97] | 33 | #include <rtems/score/apimutex.h> |
---|
[218286bc] | 34 | #include <rtems/score/stackimpl.h> |
---|
[e045fb6c] | 35 | #include <rtems/score/schedulerimpl.h> |
---|
| 36 | |
---|
[ecf0f4c] | 37 | static inline size_t _POSIX_Threads_Ensure_minimum_stack ( |
---|
| 38 | size_t size |
---|
| 39 | ) |
---|
| 40 | { |
---|
| 41 | if ( size >= PTHREAD_MINIMUM_STACK_SIZE ) |
---|
| 42 | return size; |
---|
| 43 | return PTHREAD_MINIMUM_STACK_SIZE; |
---|
| 44 | } |
---|
| 45 | |
---|
| 46 | |
---|
[03598b1] | 47 | int pthread_create( |
---|
| 48 | pthread_t *thread, |
---|
| 49 | const pthread_attr_t *attr, |
---|
| 50 | void *(*start_routine)( void * ), |
---|
| 51 | void *arg |
---|
| 52 | ) |
---|
| 53 | { |
---|
[ccd5434] | 54 | Thread_Entry_information entry = { |
---|
| 55 | .adaptor = _Thread_Entry_adaptor_pointer, |
---|
| 56 | .Kinds = { |
---|
| 57 | .Pointer = { |
---|
| 58 | .entry = start_routine, |
---|
| 59 | .argument = arg |
---|
| 60 | } |
---|
| 61 | } |
---|
| 62 | }; |
---|
[03598b1] | 63 | const pthread_attr_t *the_attr; |
---|
[eec08ef] | 64 | int low_prio; |
---|
| 65 | int high_prio; |
---|
[1a4eac50] | 66 | bool valid; |
---|
[eec08ef] | 67 | Priority_Control core_low_prio; |
---|
| 68 | Priority_Control core_high_prio; |
---|
[03598b1] | 69 | Thread_CPU_budget_algorithms budget_algorithm; |
---|
| 70 | Thread_CPU_budget_algorithm_callout budget_callout; |
---|
[f8437c8] | 71 | bool is_fp; |
---|
| 72 | bool status; |
---|
[03598b1] | 73 | Thread_Control *the_thread; |
---|
[c5831a3f] | 74 | Thread_Control *executing; |
---|
[5a32c48] | 75 | const Scheduler_Control *scheduler; |
---|
[03598b1] | 76 | POSIX_API_Control *api; |
---|
| 77 | int schedpolicy = SCHED_RR; |
---|
| 78 | struct sched_param schedparam; |
---|
[ce19f1fa] | 79 | Objects_Name name; |
---|
[eec08ef] | 80 | int error; |
---|
[e135271] | 81 | ISR_lock_Context lock_context; |
---|
[03598b1] | 82 | |
---|
[e889a857] | 83 | if ( !start_routine ) |
---|
| 84 | return EFAULT; |
---|
| 85 | |
---|
[03598b1] | 86 | the_attr = (attr) ? attr : &_POSIX_Threads_Default_attributes; |
---|
| 87 | |
---|
| 88 | if ( !the_attr->is_initialized ) |
---|
| 89 | return EINVAL; |
---|
| 90 | |
---|
| 91 | /* |
---|
[ecf0f4c] | 92 | * Core Thread Initialize ensures we get the minimum amount of |
---|
[03598b1] | 93 | * stack space if it is allowed to allocate it itself. |
---|
[ecf0f4c] | 94 | * |
---|
| 95 | * NOTE: If the user provides the stack we will let it drop below |
---|
| 96 | * twice the minimum. |
---|
[03598b1] | 97 | */ |
---|
[ecf0f4c] | 98 | if ( the_attr->stackaddr && !_Stack_Is_enough(the_attr->stacksize) ) |
---|
[03598b1] | 99 | return EINVAL; |
---|
| 100 | |
---|
[2212a2ad] | 101 | #if 0 |
---|
| 102 | int cputime_clock_allowed; /* see time.h */ |
---|
| 103 | rtems_set_errno_and_return_minus_one( ENOSYS ); |
---|
| 104 | #endif |
---|
[03598b1] | 105 | |
---|
[c5831a3f] | 106 | executing = _Thread_Get_executing(); |
---|
| 107 | |
---|
[03598b1] | 108 | /* |
---|
| 109 | * P1003.1c/Draft 10, p. 121. |
---|
| 110 | * |
---|
| 111 | * If inheritsched is set to PTHREAD_INHERIT_SCHED, then this thread |
---|
| 112 | * inherits scheduling attributes from the creating thread. If it is |
---|
[874297f3] | 113 | * PTHREAD_EXPLICIT_SCHED, then scheduling parameters come from the |
---|
[03598b1] | 114 | * attributes structure. |
---|
| 115 | */ |
---|
| 116 | switch ( the_attr->inheritsched ) { |
---|
| 117 | case PTHREAD_INHERIT_SCHED: |
---|
[51e008dd] | 118 | error = pthread_getschedparam( |
---|
| 119 | pthread_self(), |
---|
| 120 | &schedpolicy, |
---|
| 121 | &schedparam |
---|
| 122 | ); |
---|
| 123 | _Assert( error == 0 ); |
---|
[874297f3] | 124 | break; |
---|
[03598b1] | 125 | |
---|
| 126 | case PTHREAD_EXPLICIT_SCHED: |
---|
| 127 | schedpolicy = the_attr->schedpolicy; |
---|
| 128 | schedparam = the_attr->schedparam; |
---|
[874297f3] | 129 | break; |
---|
[03598b1] | 130 | |
---|
| 131 | default: |
---|
| 132 | return EINVAL; |
---|
| 133 | } |
---|
| 134 | |
---|
| 135 | /* |
---|
[874297f3] | 136 | * Check the contentionscope since rtems only supports PROCESS wide |
---|
[03598b1] | 137 | * contention (i.e. no system wide contention). |
---|
| 138 | */ |
---|
| 139 | if ( the_attr->contentionscope != PTHREAD_SCOPE_PROCESS ) |
---|
| 140 | return ENOTSUP; |
---|
| 141 | |
---|
[eec08ef] | 142 | error = _POSIX_Thread_Translate_sched_param( |
---|
[2212a2ad] | 143 | schedpolicy, |
---|
| 144 | &schedparam, |
---|
| 145 | &budget_algorithm, |
---|
| 146 | &budget_callout |
---|
| 147 | ); |
---|
[eec08ef] | 148 | if ( error != 0 ) { |
---|
| 149 | return error; |
---|
| 150 | } |
---|
| 151 | |
---|
| 152 | if ( schedpolicy == SCHED_SPORADIC ) { |
---|
| 153 | low_prio = schedparam.sched_ss_low_priority; |
---|
| 154 | high_prio = schedparam.sched_priority; |
---|
| 155 | } else { |
---|
| 156 | low_prio = schedparam.sched_priority; |
---|
| 157 | high_prio = low_prio; |
---|
| 158 | } |
---|
| 159 | |
---|
[5a32c48] | 160 | scheduler = _Scheduler_Get_own( executing ); |
---|
| 161 | |
---|
[1a4eac50] | 162 | core_low_prio = _POSIX_Priority_To_core( scheduler, low_prio, &valid ); |
---|
| 163 | if ( !valid ) { |
---|
[eec08ef] | 164 | return EINVAL; |
---|
| 165 | } |
---|
| 166 | |
---|
[1a4eac50] | 167 | core_high_prio = _POSIX_Priority_To_core( scheduler, high_prio, &valid ); |
---|
| 168 | if ( !valid ) { |
---|
[eec08ef] | 169 | return EINVAL; |
---|
| 170 | } |
---|
| 171 | |
---|
[185e46f] | 172 | #if defined(RTEMS_SMP) |
---|
| 173 | #if __RTEMS_HAVE_SYS_CPUSET_H__ |
---|
[e045fb6c] | 174 | status = _CPU_set_Is_valid( the_attr->affinityset, the_attr->affinitysetsize ); |
---|
[68c156a] | 175 | if ( !status ) |
---|
[185e46f] | 176 | return EINVAL; |
---|
| 177 | #endif |
---|
| 178 | #endif |
---|
| 179 | |
---|
[03598b1] | 180 | /* |
---|
[874297f3] | 181 | * Currently all POSIX threads are floating point if the hardware |
---|
[03598b1] | 182 | * supports it. |
---|
| 183 | */ |
---|
[335e5ca] | 184 | is_fp = true; |
---|
[03598b1] | 185 | |
---|
| 186 | /* |
---|
| 187 | * Allocate the thread control block. |
---|
| 188 | * |
---|
| 189 | * NOTE: Global threads are not currently supported. |
---|
| 190 | */ |
---|
| 191 | the_thread = _POSIX_Threads_Allocate(); |
---|
| 192 | if ( !the_thread ) { |
---|
[23fec9f0] | 193 | _Objects_Allocator_unlock(); |
---|
[03598b1] | 194 | return EAGAIN; |
---|
| 195 | } |
---|
| 196 | |
---|
| 197 | /* |
---|
| 198 | * Initialize the core thread for this task. |
---|
| 199 | */ |
---|
[ce19f1fa] | 200 | name.name_p = NULL; /* posix threads don't have a name by default */ |
---|
[03598b1] | 201 | status = _Thread_Initialize( |
---|
| 202 | &_POSIX_Threads_Information, |
---|
| 203 | the_thread, |
---|
[77ff5599] | 204 | scheduler, |
---|
[03598b1] | 205 | the_attr->stackaddr, |
---|
[ecf0f4c] | 206 | _POSIX_Threads_Ensure_minimum_stack(the_attr->stacksize), |
---|
[03598b1] | 207 | is_fp, |
---|
[eec08ef] | 208 | core_high_prio, |
---|
[b1dbfd7] | 209 | true, /* preemptible */ |
---|
[03598b1] | 210 | budget_algorithm, |
---|
| 211 | budget_callout, |
---|
| 212 | 0, /* isr level */ |
---|
[ce19f1fa] | 213 | name /* posix threads don't have a name */ |
---|
[03598b1] | 214 | ); |
---|
| 215 | if ( !status ) { |
---|
| 216 | _POSIX_Threads_Free( the_thread ); |
---|
[23fec9f0] | 217 | _Objects_Allocator_unlock(); |
---|
[03598b1] | 218 | return EAGAIN; |
---|
| 219 | } |
---|
| 220 | |
---|
[54550e04] | 221 | if ( the_attr->detachstate == PTHREAD_CREATE_DETACHED ) { |
---|
| 222 | the_thread->Life.state |= THREAD_LIFE_DETACHED; |
---|
| 223 | } |
---|
| 224 | |
---|
[da826560] | 225 | the_thread->Life.state |= THREAD_LIFE_CHANGE_DEFERRED; |
---|
| 226 | |
---|
[68c156a] | 227 | #if defined(RTEMS_SMP) && __RTEMS_HAVE_SYS_CPUSET_H__ |
---|
[e135271] | 228 | _ISR_lock_ISR_disable( &lock_context ); |
---|
[68c156a] | 229 | status = _Scheduler_Set_affinity( |
---|
| 230 | the_thread, |
---|
| 231 | the_attr->affinitysetsize, |
---|
| 232 | the_attr->affinityset |
---|
[e045fb6c] | 233 | ); |
---|
[e135271] | 234 | _ISR_lock_ISR_enable( &lock_context ); |
---|
[68c156a] | 235 | if ( !status ) { |
---|
| 236 | _POSIX_Threads_Free( the_thread ); |
---|
| 237 | _RTEMS_Unlock_allocator(); |
---|
| 238 | return EINVAL; |
---|
| 239 | } |
---|
[185e46f] | 240 | #endif |
---|
| 241 | |
---|
[03598b1] | 242 | /* |
---|
| 243 | * finish initializing the per API structure |
---|
| 244 | */ |
---|
| 245 | api = the_thread->API_Extensions[ THREAD_API_POSIX ]; |
---|
| 246 | |
---|
[185e46f] | 247 | _POSIX_Threads_Copy_attributes( &api->Attributes, the_attr ); |
---|
[eec08ef] | 248 | api->Sporadic.low_priority = core_low_prio; |
---|
| 249 | api->Sporadic.high_priority = core_high_prio; |
---|
[03598b1] | 250 | |
---|
[917884c] | 251 | if ( schedpolicy == SCHED_SPORADIC ) { |
---|
| 252 | _ISR_lock_ISR_disable( &lock_context ); |
---|
| 253 | _POSIX_Threads_Sporadic_timer_insert( the_thread, api ); |
---|
| 254 | _ISR_lock_ISR_enable( &lock_context ); |
---|
| 255 | } |
---|
| 256 | |
---|
[03598b1] | 257 | /* |
---|
| 258 | * POSIX threads are allocated and started in one operation. |
---|
| 259 | */ |
---|
[33829ce] | 260 | _ISR_lock_ISR_disable( &lock_context ); |
---|
| 261 | status = _Thread_Start( the_thread, &entry, &lock_context ); |
---|
[03598b1] | 262 | |
---|
[2212a2ad] | 263 | #if defined(RTEMS_DEBUG) |
---|
| 264 | /* |
---|
| 265 | * _Thread_Start only fails if the thread was in the incorrect state |
---|
[1de949a8] | 266 | * |
---|
[2212a2ad] | 267 | * NOTE: This can only happen if someone slips in and touches the |
---|
| 268 | * thread while we are creating it. |
---|
| 269 | */ |
---|
| 270 | if ( !status ) { |
---|
| 271 | _POSIX_Threads_Free( the_thread ); |
---|
[23fec9f0] | 272 | _Objects_Allocator_unlock(); |
---|
[2212a2ad] | 273 | return EINVAL; |
---|
| 274 | } |
---|
| 275 | #endif |
---|
| 276 | |
---|
[03598b1] | 277 | /* |
---|
| 278 | * Return the id and indicate we successfully created the thread |
---|
| 279 | */ |
---|
| 280 | *thread = the_thread->Object.id; |
---|
| 281 | |
---|
[23fec9f0] | 282 | _Objects_Allocator_unlock(); |
---|
[5088d97] | 283 | return 0; |
---|
[03598b1] | 284 | } |
---|