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1 /*
2    Copyright (c) 2011-2016  mingw-w64 project
3 
4    Permission is hereby granted, free of charge, to any person obtaining a
5    copy of this software and associated documentation files (the "Software"),
6    to deal in the Software without restriction, including without limitation
7    the rights to use, copy, modify, merge, publish, distribute, sublicense,
8    and/or sell copies of the Software, and to permit persons to whom the
9    Software is furnished to do so, subject to the following conditions:
10 
11    The above copyright notice and this permission notice shall be included in
12    all copies or substantial portions of the Software.
13 
14    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
20    DEALINGS IN THE SOFTWARE.
21 */
22 
23 #include <windows.h>
24 #include <stdio.h>
25 #include "pthread.h"
26 #include "thread.h"
27 
28 #include "misc.h"
29 
sched_get_priority_min(int pol)30 int sched_get_priority_min(int pol)
31 {
32   if (pol < SCHED_MIN || pol > SCHED_MAX) {
33       errno = EINVAL;
34       return -1;
35   }
36 
37   return THREAD_PRIORITY_IDLE;
38 }
39 
sched_get_priority_max(int pol)40 int sched_get_priority_max(int pol)
41 {
42   if (pol < SCHED_MIN || pol > SCHED_MAX) {
43       errno = EINVAL;
44       return -1;
45   }
46 
47   return THREAD_PRIORITY_TIME_CRITICAL;
48 }
49 
pthread_attr_setschedparam(pthread_attr_t * attr,const struct sched_param * p)50 int pthread_attr_setschedparam(pthread_attr_t *attr, const struct sched_param *p)
51 {
52     int r = 0;
53 
54     if (attr == NULL || p == NULL) {
55         return EINVAL;
56     }
57     memcpy(&attr->param, p, sizeof (*p));
58     return r;
59 }
60 
pthread_attr_getschedparam(const pthread_attr_t * attr,struct sched_param * p)61 int pthread_attr_getschedparam(const pthread_attr_t *attr, struct sched_param *p)
62 {
63     int r = 0;
64 
65     if (attr == NULL || p == NULL) {
66         return EINVAL;
67     }
68     memcpy(p, &attr->param, sizeof (*p));
69     return r;
70 }
71 
pthread_attr_setschedpolicy(pthread_attr_t * attr,int pol)72 int pthread_attr_setschedpolicy (pthread_attr_t *attr, int pol)
73 {
74   if (!attr || pol < SCHED_MIN || pol > SCHED_MAX)
75     return EINVAL;
76   if (pol != SCHED_OTHER)
77     return ENOTSUP;
78   return 0;
79 }
80 
pthread_attr_getschedpolicy(const pthread_attr_t * attr,int * pol)81 int pthread_attr_getschedpolicy (const pthread_attr_t *attr, int *pol)
82 {
83   if (!attr || !pol)
84     return EINVAL;
85   *pol = SCHED_OTHER;
86   return 0;
87 }
88 
pthread_check(pthread_t t)89 static int pthread_check(pthread_t t)
90 {
91   struct _pthread_v *pv;
92   DWORD dwFlags;
93   if (!t)
94     return ESRCH;
95   pv = __pth_gpointer_locked (t);
96   if (!(pv->h) || pv->h == INVALID_HANDLE_VALUE)
97   {
98   	if (pv->ended == 0)
99   	  return 0;
100         return ESRCH;
101   }
102   else if ((!GetHandleInformation(pv->h, &dwFlags) && pv->ended))
103         return ESRCH;
104   return 0;
105 }
106 
pthread_getschedparam(pthread_t t,int * pol,struct sched_param * p)107 int pthread_getschedparam(pthread_t t, int *pol, struct sched_param *p)
108 {
109     int r;
110     //if (!t)
111     //  t = pthread_self();
112 
113     if ((r = pthread_check(t)) != 0)
114     {
115         return r;
116     }
117 
118     if (!p || !pol)
119     {
120         return EINVAL;
121     }
122     *pol = __pth_gpointer_locked (t)->sched_pol;
123     p->sched_priority = __pth_gpointer_locked (t)->sched.sched_priority;
124 
125     return 0;
126 }
127 
pthread_setschedparam(pthread_t t,int pol,const struct sched_param * p)128 int pthread_setschedparam(pthread_t t, int pol,  const struct sched_param *p)
129 {
130   struct _pthread_v *pv;
131     int r, pr = 0;
132     //if (!t.p) t = pthread_self();
133 
134     if ((r = pthread_check(t)) != 0)
135         return r;
136 
137     if (pol < SCHED_MIN || pol > SCHED_MAX || p == NULL)
138         return EINVAL;
139     if (pol != SCHED_OTHER)
140         return ENOTSUP;
141     pr = p->sched_priority;
142     if (pr < sched_get_priority_min(pol) || pr > sched_get_priority_max(pol))
143       return EINVAL;
144 
145     /* See msdn: there are actually 7 priorities:
146     THREAD_PRIORITY_IDLE    -      -15
147     THREAD_PRIORITY_LOWEST          -2
148     THREAD_PRIORITY_BELOW_NORMAL    -1
149     THREAD_PRIORITY_NORMAL           0
150     THREAD_PRIORITY_ABOVE_NORMAL     1
151     THREAD_PRIORITY_HIGHEST          2
152     THREAD_PRIORITY_TIME_CRITICAL   15
153     */
154     if (pr <= THREAD_PRIORITY_IDLE) {
155         pr = THREAD_PRIORITY_IDLE;
156     } else if (pr <= THREAD_PRIORITY_LOWEST) {
157         pr = THREAD_PRIORITY_LOWEST;
158     } else if (pr >= THREAD_PRIORITY_TIME_CRITICAL) {
159         pr = THREAD_PRIORITY_TIME_CRITICAL;
160     } else if (pr >= THREAD_PRIORITY_HIGHEST) {
161         pr = THREAD_PRIORITY_HIGHEST;
162     }
163     pv = __pth_gpointer_locked (t);
164     if (SetThreadPriority(pv->h, pr)) {
165         pv->sched_pol = pol;
166         pv->sched.sched_priority = p->sched_priority;
167     } else
168         r = EINVAL;
169     return r;
170 }
171 
sched_getscheduler(pid_t pid)172 int sched_getscheduler(pid_t pid)
173 {
174   if (pid != 0)
175   {
176       HANDLE h = NULL;
177       int selfPid = (int) GetCurrentProcessId ();
178 
179       if (pid != (pid_t) selfPid && (h = OpenProcess (PROCESS_QUERY_INFORMATION, 0, (DWORD) pid)) == NULL)
180       {
181 	  errno = (GetLastError () == (0xFF & ERROR_ACCESS_DENIED)) ? EPERM : ESRCH;
182 	  return -1;
183       }
184       if (h)
185 	  CloseHandle (h);
186   }
187   return SCHED_OTHER;
188 }
189 
sched_setscheduler(pid_t pid,int pol,const struct sched_param * param)190 int sched_setscheduler(pid_t pid, int pol, const struct sched_param *param)
191 {
192   if (!param)
193     {
194       errno = EINVAL;
195       return -1;
196     }
197   if (pid != 0)
198   {
199       HANDLE h = NULL;
200       int selfPid = (int) GetCurrentProcessId ();
201 
202       if (pid != (pid_t) selfPid && (h = OpenProcess (PROCESS_SET_INFORMATION, 0, (DWORD) pid)) == NULL)
203       {
204 	  errno = (GetLastError () == (0xFF & ERROR_ACCESS_DENIED)) ? EPERM : ESRCH;
205 	  return -1;
206       }
207       if (h)
208           CloseHandle (h);
209   }
210 
211   if (pol != SCHED_OTHER)
212   {
213       errno = ENOSYS;
214       return -1;
215   }
216   return SCHED_OTHER;
217 }
218 
sched_yield(void)219 int sched_yield(void)
220 {
221   Sleep(0);
222   return 0;
223 }
224