23 |
|
|
24 |
#include "Thread.h" |
#include "Thread.h" |
25 |
|
|
26 |
|
// this is the minimum stack size a thread will be spawned with |
27 |
|
// if this value is too small, the OS will allocate memory on demand and |
28 |
|
// thus might lead to dropouts in realtime threads |
29 |
|
// TODO: should be up for testing to get a reasonable good value |
30 |
|
#define MIN_STACK_SIZE 524288 |
31 |
|
|
32 |
namespace LinuxSampler { |
namespace LinuxSampler { |
33 |
|
|
34 |
Thread::Thread(bool LockMemory, bool RealTime, int PriorityMax, int PriorityDelta) { |
Thread::Thread(bool LockMemory, bool RealTime, int PriorityMax, int PriorityDelta) { |
35 |
this->bLockedMemory = LockMemory; |
this->bLockedMemory = LockMemory; |
36 |
this->isRealTime = RealTime; |
this->isRealTime = RealTime; |
|
this->Running = false; |
|
37 |
this->PriorityDelta = PriorityDelta; |
this->PriorityDelta = PriorityDelta; |
38 |
this->PriorityMax = PriorityMax; |
this->PriorityMax = PriorityMax; |
39 |
__thread_destructor_key = 0; |
__thread_destructor_key = 0; |
40 |
pthread_mutex_init(&__thread_state_mutex, NULL); |
pthread_attr_init(&__thread_attr); |
|
pthread_cond_init(&__thread_start_condition, NULL); |
|
|
pthread_cond_init(&__thread_exit_condition, NULL); |
|
41 |
} |
} |
42 |
|
|
43 |
Thread::~Thread() { |
Thread::~Thread() { |
44 |
StopThread(); |
StopThread(); |
45 |
pthread_cond_destroy(&__thread_start_condition); |
pthread_attr_destroy(&__thread_attr); |
|
pthread_cond_destroy(&__thread_exit_condition); |
|
|
pthread_mutex_destroy(&__thread_state_mutex); |
|
46 |
} |
} |
47 |
|
|
48 |
/** |
/** |
52 |
* Main() method in your subclass. |
* Main() method in your subclass. |
53 |
*/ |
*/ |
54 |
int Thread::StartThread() { |
int Thread::StartThread() { |
55 |
pthread_mutex_lock(&__thread_state_mutex); |
RunningCondition.Lock(); |
56 |
if (!Running) { |
if (!RunningCondition.GetUnsafe()) { |
57 |
SignalStartThread(); |
SignalStartThread(); |
58 |
pthread_cond_wait(&__thread_start_condition, &__thread_state_mutex); |
// wait until thread started execution |
59 |
|
RunningCondition.WaitIf(false); |
60 |
} |
} |
61 |
pthread_mutex_unlock(&__thread_state_mutex); |
RunningCondition.Unlock(); |
62 |
return 0; |
return 0; |
63 |
} |
} |
64 |
|
|
71 |
* @see StartThread() |
* @see StartThread() |
72 |
*/ |
*/ |
73 |
int Thread::SignalStartThread() { |
int Thread::SignalStartThread() { |
74 |
|
// prepare the thread properties |
75 |
|
int res = pthread_attr_setinheritsched(&__thread_attr, PTHREAD_EXPLICIT_SCHED); |
76 |
|
if (res) { |
77 |
|
std::cerr << "Thread creation failed: Could not inherit thread properties." |
78 |
|
<< std::endl << std::flush; |
79 |
|
RunningCondition.Set(false); |
80 |
|
return res; |
81 |
|
} |
82 |
|
res = pthread_attr_setdetachstate(&__thread_attr, PTHREAD_CREATE_JOINABLE); |
83 |
|
if (res) { |
84 |
|
std::cerr << "Thread creation failed: Could not request a joinable thread." |
85 |
|
<< std::endl << std::flush; |
86 |
|
RunningCondition.Set(false); |
87 |
|
return res; |
88 |
|
} |
89 |
|
res = pthread_attr_setscope(&__thread_attr, PTHREAD_SCOPE_SYSTEM); |
90 |
|
if (res) { |
91 |
|
std::cerr << "Thread creation failed: Could not request system scope for thread scheduling." |
92 |
|
<< std::endl << std::flush; |
93 |
|
RunningCondition.Set(false); |
94 |
|
return res; |
95 |
|
} |
96 |
|
res = pthread_attr_setstacksize(&__thread_attr, MIN_STACK_SIZE); |
97 |
|
if (res) { |
98 |
|
std::cerr << "Thread creation failed: Could not set minimum stack size." |
99 |
|
<< std::endl << std::flush; |
100 |
|
RunningCondition.Set(false); |
101 |
|
return res; |
102 |
|
} |
103 |
// Create and run the thread |
// Create and run the thread |
104 |
int res = pthread_create(&this->__thread_id, NULL, __pthread_launcher, this); |
res = pthread_create(&this->__thread_id, &__thread_attr, __pthread_launcher, this); |
105 |
switch (res) { |
switch (res) { |
106 |
case 0: // Success |
case 0: // Success |
107 |
break; |
break; |
108 |
case EAGAIN: |
case EAGAIN: |
109 |
std::cerr << "Thread creation failed: System doesn't allow to create another thread." |
std::cerr << "Thread creation failed: System doesn't allow to create another thread." |
110 |
<< std::endl << std::flush; |
<< std::endl << std::flush; |
111 |
this->Running = false; |
RunningCondition.Set(false); |
112 |
break; |
break; |
113 |
case EPERM: |
case EPERM: |
114 |
std::cerr << "Thread creation failed: You're lacking permisssions to set required scheduling policy and parameters." |
std::cerr << "Thread creation failed: You're lacking permisssions to set required scheduling policy and parameters." |
115 |
<< std::endl << std::flush; |
<< std::endl << std::flush; |
116 |
this->Running = false; |
RunningCondition.Set(false); |
117 |
break; |
break; |
118 |
default: |
default: |
119 |
std::cerr << "Thread creation failed: Unknown cause." |
std::cerr << "Thread creation failed: Unknown cause." |
120 |
<< std::endl << std::flush; |
<< std::endl << std::flush; |
121 |
this->Running = false; |
RunningCondition.Set(false); |
122 |
break; |
break; |
123 |
} |
} |
124 |
return res; |
return res; |
129 |
* it's execution before it will return. |
* it's execution before it will return. |
130 |
*/ |
*/ |
131 |
int Thread::StopThread() { |
int Thread::StopThread() { |
132 |
pthread_mutex_lock(&__thread_state_mutex); |
RunningCondition.Lock(); |
133 |
if (Running) { |
if (RunningCondition.GetUnsafe()) { |
134 |
SignalStopThread(); |
SignalStopThread(); |
135 |
pthread_cond_wait(&__thread_exit_condition, &__thread_state_mutex); |
// wait until thread stopped execution |
136 |
|
RunningCondition.WaitIf(true); |
137 |
pthread_detach(__thread_id); |
pthread_detach(__thread_id); |
138 |
} |
} |
139 |
pthread_mutex_unlock(&__thread_state_mutex); |
RunningCondition.Unlock(); |
140 |
return 0; |
return 0; |
141 |
} |
} |
142 |
|
|
148 |
* @see StopThread() |
* @see StopThread() |
149 |
*/ |
*/ |
150 |
int Thread::SignalStopThread() { |
int Thread::SignalStopThread() { |
151 |
|
//FIXME: segfaults when thread is not yet running |
152 |
pthread_cancel(__thread_id); |
pthread_cancel(__thread_id); |
153 |
return 0; |
return 0; |
154 |
} |
} |
157 |
* Returns @c true in case the thread is currently running. |
* Returns @c true in case the thread is currently running. |
158 |
*/ |
*/ |
159 |
bool Thread::IsRunning() { |
bool Thread::IsRunning() { |
160 |
return Running; |
return RunningCondition.GetUnsafe(); |
161 |
} |
} |
162 |
|
|
163 |
/** |
/** |
169 |
*/ |
*/ |
170 |
int Thread::SetSchedulingPriority() { |
int Thread::SetSchedulingPriority() { |
171 |
#if !defined(__APPLE__) |
#if !defined(__APPLE__) |
172 |
|
int policy; |
173 |
|
char* policyDescription = NULL; |
174 |
|
if (isRealTime) { // becomes a RT thread |
175 |
|
policy = SCHED_FIFO; |
176 |
|
policyDescription = "realtime"; |
177 |
|
} else { // 'normal', non-RT thread |
178 |
|
policy = SCHED_OTHER; |
179 |
|
policyDescription = "normal (non-RT)"; |
180 |
|
} |
181 |
|
// set selected scheduling policy and priority |
182 |
struct sched_param schp; |
struct sched_param schp; |
|
|
|
|
if (!isRealTime) return 0; |
|
|
|
|
|
/* |
|
|
* set the process to realtime privs |
|
|
*/ |
|
183 |
memset(&schp, 0, sizeof(schp)); |
memset(&schp, 0, sizeof(schp)); |
184 |
if (this->PriorityMax == 1) { |
if (this->PriorityMax == 1) { |
185 |
schp.sched_priority = sched_get_priority_max(SCHED_FIFO) + this->PriorityDelta; |
schp.sched_priority = sched_get_priority_max(policy) + this->PriorityDelta; |
186 |
} |
} |
187 |
if (this->PriorityMax == -1) { |
if (this->PriorityMax == -1) { |
188 |
schp.sched_priority = sched_get_priority_min(SCHED_FIFO) + this->PriorityDelta; |
schp.sched_priority = sched_get_priority_min(policy) + this->PriorityDelta; |
189 |
} |
} |
190 |
|
if (pthread_setschedparam(__thread_id, policy, &schp) != 0) { |
191 |
if (sched_setscheduler(0, SCHED_FIFO, &schp) != 0) { |
std::cerr << "Thread: WARNING, can't assign " |
192 |
perror("Thread: WARNING, can't assign realtime scheduling to thread!"); |
<< policyDescription |
193 |
|
<< " scheduling to thread!" |
194 |
|
<< std::endl << std::flush; |
195 |
return -1; |
return -1; |
196 |
} |
} |
197 |
#endif |
#endif |
205 |
#if !defined(__APPLE__) |
#if !defined(__APPLE__) |
206 |
if (!bLockedMemory) return 0; |
if (!bLockedMemory) return 0; |
207 |
if (mlockall(MCL_CURRENT | MCL_FUTURE) < 0) { |
if (mlockall(MCL_CURRENT | MCL_FUTURE) < 0) { |
208 |
perror("Thread: WARNING, can't mlockall() memory!"); |
std::cerr << "Thread: WARNING, can't mlockall() memory!\n" |
209 |
|
<< std::flush; |
210 |
return -1; |
return -1; |
211 |
} |
} |
212 |
#endif |
#endif |
220 |
* CALL THIS METHOD YOURSELF! |
* CALL THIS METHOD YOURSELF! |
221 |
*/ |
*/ |
222 |
void Thread::EnableDestructor() { |
void Thread::EnableDestructor() { |
223 |
pthread_mutex_lock(&__thread_state_mutex); |
RunningCondition.Lock(); |
224 |
pthread_key_create(&__thread_destructor_key, __pthread_destructor); |
pthread_key_create(&__thread_destructor_key, __pthread_destructor); |
225 |
pthread_setspecific(__thread_destructor_key, this); |
pthread_setspecific(__thread_destructor_key, this); |
226 |
Running = true; |
RunningCondition.Set(true); |
227 |
pthread_mutex_unlock(&__thread_state_mutex); |
RunningCondition.Unlock(); |
|
pthread_cond_broadcast(&__thread_start_condition); |
|
228 |
} |
} |
229 |
|
|
230 |
/** |
/** |
232 |
*/ |
*/ |
233 |
int Thread::Destructor() { |
int Thread::Destructor() { |
234 |
pthread_key_delete(__thread_destructor_key); |
pthread_key_delete(__thread_destructor_key); |
235 |
pthread_mutex_lock(&__thread_state_mutex); |
RunningCondition.Set(false); |
|
Running = false; |
|
|
pthread_mutex_unlock(&__thread_state_mutex); |
|
|
pthread_cond_broadcast(&__thread_exit_condition); |
|
236 |
return 0; |
return 0; |
237 |
} |
} |
238 |
|
|