e14743d1 |
1 | /* |
2 | SDL - Simple DirectMedia Layer |
3 | Copyright (C) 1997-2009 Sam Lantinga |
4 | |
5 | This library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | This library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with this library; if not, write to the Free Software |
17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
18 | |
19 | Sam Lantinga |
20 | slouken@libsdl.org |
21 | */ |
22 | #include "SDL_config.h" |
23 | |
24 | #ifdef SDL_TIMER_OS2 |
25 | |
26 | #define INCL_DOSMISC |
27 | #define INCL_DOSERRORS |
28 | #define INCL_DOSSEMAPHORES |
29 | #define INCL_DOSDATETIME |
30 | #define INCL_DOSPROCESS |
31 | #define INCL_DOSPROFILE |
32 | #define INCL_DOSEXCEPTIONS |
33 | #include <os2.h> |
34 | |
35 | #include "SDL_thread.h" |
36 | #include "SDL_timer.h" |
37 | #include "../SDL_timer_c.h" |
38 | |
39 | |
40 | #define TIME_WRAP_VALUE (~(DWORD)0) |
41 | |
42 | /* The first high-resolution ticks value of the application */ |
43 | static long long hires_start_ticks; |
44 | /* The number of ticks per second of the high-resolution performance counter */ |
45 | static ULONG hires_ticks_per_second; |
46 | |
47 | void SDL_StartTicks(void) |
48 | { |
49 | DosTmrQueryFreq(&hires_ticks_per_second); |
50 | DosTmrQueryTime((PQWORD)&hires_start_ticks); |
51 | } |
52 | |
53 | DECLSPEC Uint32 SDLCALL SDL_GetTicks(void) |
54 | { |
55 | long long hires_now; |
56 | ULONG ticks = ticks; |
57 | |
58 | DosTmrQueryTime((PQWORD)&hires_now); |
59 | /* |
60 | hires_now -= hires_start_ticks; |
61 | hires_now *= 1000; |
62 | hires_now /= hires_ticks_per_second; |
63 | */ |
64 | /* inline asm to avoid runtime inclusion */ |
65 | _asm { |
66 | push edx |
67 | push eax |
68 | mov eax, dword ptr hires_now |
69 | mov edx, dword ptr hires_now+4 |
70 | sub eax, dword ptr hires_start_ticks |
71 | sbb edx, dword ptr hires_start_ticks+4 |
72 | mov ebx,1000 |
73 | mov ecx,edx |
74 | mul ebx |
75 | push eax |
76 | push edx |
77 | mov eax,ecx |
78 | mul ebx |
79 | pop eax |
80 | add edx,eax |
81 | pop eax |
82 | mov ebx, dword ptr hires_ticks_per_second |
83 | div ebx |
84 | mov dword ptr ticks, eax |
85 | pop edx |
86 | pop eax |
87 | } |
88 | |
89 | return ticks; |
90 | |
91 | } |
92 | |
93 | /* High resolution sleep, originally made by Ilya Zakharevich */ |
94 | DECLSPEC void SDLCALL SDL_Delay(Uint32 ms) |
95 | { |
96 | /* This is similar to DosSleep(), but has 8ms granularity in time-critical |
97 | threads even on Warp3. */ |
98 | HEV hevEvent1 = 0; /* Event semaphore handle */ |
99 | HTIMER htimerEvent1 = 0; /* Timer handle */ |
100 | APIRET rc = NO_ERROR; /* Return code */ |
101 | int ret = 1; |
102 | ULONG priority = 0, nesting; /* Shut down the warnings */ |
103 | PPIB pib; |
104 | PTIB tib; |
105 | char *e = NULL; |
106 | APIRET badrc; |
107 | int switch_priority = 50; |
108 | |
109 | DosCreateEventSem(NULL, /* Unnamed */ |
110 | &hevEvent1, /* Handle of semaphore returned */ |
111 | DC_SEM_SHARED, /* Shared needed for DosAsyncTimer */ |
112 | FALSE); /* Semaphore is in RESET state */ |
113 | |
114 | if (ms >= switch_priority) |
115 | switch_priority = 0; |
116 | if (switch_priority) |
117 | { |
118 | if (DosGetInfoBlocks(&tib, &pib)!=NO_ERROR) |
119 | switch_priority = 0; |
120 | else |
121 | { |
122 | /* In Warp3, to switch scheduling to 8ms step, one needs to do |
123 | DosAsyncTimer() in time-critical thread. On laters versions, |
124 | more and more cases of wait-for-something are covered. |
125 | |
126 | It turns out that on Warp3fp42 it is the priority at the time |
127 | of DosAsyncTimer() which matters. Let's hope that this works |
128 | with later versions too... XXXX |
129 | */ |
130 | priority = (tib->tib_ptib2->tib2_ulpri); |
131 | if ((priority & 0xFF00) == 0x0300) /* already time-critical */ |
132 | switch_priority = 0; |
133 | /* Make us time-critical. Just modifying TIB is not enough... */ |
134 | /* tib->tib_ptib2->tib2_ulpri = 0x0300;*/ |
135 | /* We do not want to run at high priority if a signal causes us |
136 | to longjmp() out of this section... */ |
137 | if (DosEnterMustComplete(&nesting)) |
138 | switch_priority = 0; |
139 | else |
140 | DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0); |
141 | } |
142 | } |
143 | |
144 | if ((badrc = DosAsyncTimer(ms, |
145 | (HSEM) hevEvent1, /* Semaphore to post */ |
146 | &htimerEvent1))) /* Timer handler (returned) */ |
147 | e = "DosAsyncTimer"; |
148 | |
149 | if (switch_priority && tib->tib_ptib2->tib2_ulpri == 0x0300) |
150 | { |
151 | /* Nobody switched priority while we slept... Ignore errors... */ |
152 | /* tib->tib_ptib2->tib2_ulpri = priority; */ /* Get back... */ |
153 | if (!(rc = DosSetPriority(PRTYS_THREAD, (priority>>8) & 0xFF, 0, 0))) |
154 | rc = DosSetPriority(PRTYS_THREAD, 0, priority & 0xFF, 0); |
155 | } |
156 | if (switch_priority) |
157 | rc = DosExitMustComplete(&nesting); /* Ignore errors */ |
158 | |
159 | /* The actual blocking call is made with "normal" priority. This way we |
160 | should not bother with DosSleep(0) etc. to compensate for us interrupting |
161 | higher-priority threads. The goal is to prohibit the system spending too |
162 | much time halt()ing, not to run us "no matter what". */ |
163 | if (!e) /* Wait for AsyncTimer event */ |
164 | badrc = DosWaitEventSem(hevEvent1, SEM_INDEFINITE_WAIT); |
165 | |
166 | if (e) ; /* Do nothing */ |
167 | else if (badrc == ERROR_INTERRUPT) |
168 | ret = 0; |
169 | else if (badrc) |
170 | e = "DosWaitEventSem"; |
171 | if ((rc = DosCloseEventSem(hevEvent1)) && !e) { /* Get rid of semaphore */ |
172 | e = "DosCloseEventSem"; |
173 | badrc = rc; |
174 | } |
175 | if (e) |
176 | { |
177 | SDL_SetError("[SDL_Delay] : Had error in %s(), rc is 0x%x\n", e, badrc); |
178 | } |
179 | } |
180 | |
181 | /* Data to handle a single periodic alarm */ |
182 | static int timer_alive = 0; |
183 | static SDL_Thread *timer = NULL; |
184 | |
185 | static int SDLCALL RunTimer(void *unused) |
186 | { |
187 | DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0); |
188 | while ( timer_alive ) { |
189 | if ( SDL_timer_running ) { |
190 | SDL_ThreadedTimerCheck(); |
191 | } |
192 | SDL_Delay(10); |
193 | } |
194 | return(0); |
195 | } |
196 | |
197 | /* This is only called if the event thread is not running */ |
198 | int SDL_SYS_TimerInit(void) |
199 | { |
200 | timer_alive = 1; |
201 | timer = SDL_CreateThread(RunTimer, NULL); |
202 | if ( timer == NULL ) |
203 | return(-1); |
204 | return(SDL_SetTimerThreaded(1)); |
205 | } |
206 | |
207 | void SDL_SYS_TimerQuit(void) |
208 | { |
209 | timer_alive = 0; |
210 | if ( timer ) { |
211 | SDL_WaitThread(timer, NULL); |
212 | timer = NULL; |
213 | } |
214 | } |
215 | |
216 | int SDL_SYS_StartTimer(void) |
217 | { |
218 | SDL_SetError("Internal logic error: OS/2 uses threaded timer"); |
219 | return(-1); |
220 | } |
221 | |
222 | void SDL_SYS_StopTimer(void) |
223 | { |
224 | return; |
225 | } |
226 | |
227 | #endif /* SDL_TIMER_OS2 */ |