summaryrefslogtreecommitdiffstatshomepage
path: root/src/osd/modules/lib/osdlib_win32.c
blob: 4d78820f7d6de3b9f5583c06415f3e99c8392a3f (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
//============================================================
//
//  sdlos_*.c - OS specific low level code
//
//  Copyright (c) 1996-2010, Nicola Salmoria and the MAME Team.
//  Visit http://mamedev.org for licensing and usage restrictions.
//
//  SDLMAME by Olivier Galibert and R. Belmont
//
//============================================================

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <mmsystem.h>

#include <stdlib.h>
#ifndef _MSC_VER
#include <unistd.h>
#endif

// MAME headers
#include "osdlib.h"
#include "osdcomm.h"
#include "osdcore.h"

#ifdef OSD_WINDOWS
#include "winutf8.h"
#endif

//============================================================
//  MACROS
//============================================================

// presumed size of a page of memory
#define PAGE_SIZE           4096

// align allocations to start or end of the page?
#define GUARD_ALIGN_START   0


//============================================================
//  GLOBAL VARIABLES
//============================================================

#ifdef OSD_WINDOWS
void (*s_debugger_stack_crawler)() = NULL;
#endif


//============================================================
//  osd_getenv
//============================================================

const char *osd_getenv(const char *name)
{
    return getenv(name);
}


//============================================================
//  osd_setenv
//============================================================

int osd_setenv(const char *name, const char *value, int overwrite)
{
    char *buf;
    int result;

    if (!overwrite)
    {
        if (osd_getenv(name) != NULL)
            return 0;
    }
    buf = (char *) osd_malloc_array(strlen(name)+strlen(value)+2);
    sprintf(buf, "%s=%s", name, value);
    result = putenv(buf);

    /* will be referenced by environment
     * Therefore it is not freed here
     */

    return result;
}

//============================================================
//  osd_process_kill
//============================================================

void osd_process_kill(void)
{
    TerminateProcess(GetCurrentProcess(), -1);
}

//============================================================
//  osd_num_processors
//============================================================

int osd_get_num_processors(void)
{
    SYSTEM_INFO info;

    // otherwise, fetch the info from the system
    GetSystemInfo(&info);

    // max out at 4 for now since scaling above that seems to do poorly
    return MIN(info.dwNumberOfProcessors, 4);
}

//============================================================
//  osd_malloc
//============================================================

void *osd_malloc(size_t size)
{
#ifndef MALLOC_DEBUG
    return HeapAlloc(GetProcessHeap(), 0, size);
#else
    // add in space for the size
    size += sizeof(size_t);

    // basic objects just come from the heap
    void *result = HeapAlloc(GetProcessHeap(), 0, size);

    // store the size and return and pointer to the data afterward
    *reinterpret_cast<size_t *>(result) = size;
    return reinterpret_cast<UINT8 *>(result) + sizeof(size_t);
#endif
}


//============================================================
//  osd_malloc_array
//============================================================

void *osd_malloc_array(size_t size)
{
#ifndef MALLOC_DEBUG
    return HeapAlloc(GetProcessHeap(), 0, size);
#else
    // add in space for the size
    size += sizeof(size_t);

    // round the size up to a page boundary
    size_t rounded_size = ((size + sizeof(void *) + PAGE_SIZE - 1) / PAGE_SIZE) * PAGE_SIZE;

    // reserve that much memory, plus two guard pages
    void *page_base = VirtualAlloc(NULL, rounded_size + 2 * PAGE_SIZE, MEM_RESERVE, PAGE_NOACCESS);
    if (page_base == NULL)
        return NULL;

    // now allow access to everything but the first and last pages
    page_base = VirtualAlloc(reinterpret_cast<UINT8 *>(page_base) + PAGE_SIZE, rounded_size, MEM_COMMIT, PAGE_READWRITE);
    if (page_base == NULL)
        return NULL;

    // work backwards from the page base to get to the block base
    void *result = GUARD_ALIGN_START ? page_base : (reinterpret_cast<UINT8 *>(page_base) + rounded_size - size);

    // store the size at the start with a flag indicating it has a guard page
    *reinterpret_cast<size_t *>(result) = size | 0x80000000;
    return reinterpret_cast<UINT8 *>(result) + sizeof(size_t);
#endif
}


//============================================================
//  osd_free
//============================================================

void osd_free(void *ptr)
{
#ifndef MALLOC_DEBUG
    HeapFree(GetProcessHeap(), 0, ptr);
#else
    size_t size = reinterpret_cast<size_t *>(ptr)[-1];

    // if no guard page, just free the pointer
    if ((size & 0x80000000) == 0)
        HeapFree(GetProcessHeap(), 0, reinterpret_cast<UINT8 *>(ptr) - sizeof(size_t));

    // large items need more care
    else
    {
        ULONG_PTR page_base = (reinterpret_cast<ULONG_PTR>(ptr) - sizeof(size_t)) & ~(PAGE_SIZE - 1);
        VirtualFree(reinterpret_cast<void *>(page_base - PAGE_SIZE), 0, MEM_RELEASE);
    }
#endif
}


//============================================================
//  osd_alloc_executable
//
//  allocates "size" bytes of executable memory.  this must take
//  things like NX support into account.
//============================================================

void *osd_alloc_executable(size_t size)
{
    return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
}


//============================================================
//  osd_free_executable
//
//  frees memory allocated with osd_alloc_executable
//============================================================

void osd_free_executable(void *ptr, size_t size)
{
    VirtualFree(ptr, 0, MEM_RELEASE);
}


//============================================================
//  osd_break_into_debugger
//============================================================

void osd_break_into_debugger(const char *message)
{
#ifdef OSD_WINDOWS
    if (IsDebuggerPresent())
    {
        win_output_debug_string_utf8(message);
        DebugBreak();
    }
    else if (s_debugger_stack_crawler != NULL)
        (*s_debugger_stack_crawler)();
#else
    if (IsDebuggerPresent())
    {
        OutputDebugStringA(message);
        DebugBreak();
    }
#endif
}

//============================================================
//  GLOBAL VARIABLES
//============================================================

static osd_ticks_t ticks_per_second = 0;
static osd_ticks_t suspend_ticks = 0;
static BOOL using_qpc = TRUE;



//============================================================
//  osd_ticks
//============================================================

osd_ticks_t osd_ticks(void)
{
    LARGE_INTEGER performance_count;

    // if we're suspended, just return that
    if (suspend_ticks != 0)
        return suspend_ticks;

    // if we have a per second count, just go for it
    if (ticks_per_second != 0)
    {
        // QueryPerformanceCounter if we can
        if (using_qpc)
        {
            QueryPerformanceCounter(&performance_count);
            return (osd_ticks_t)performance_count.QuadPart - suspend_ticks;
        }

        // otherwise, fall back to timeGetTime
        else
            return (osd_ticks_t)timeGetTime() - suspend_ticks;
    }

    // if not, we have to determine it
    using_qpc = QueryPerformanceFrequency(&performance_count) && (performance_count.QuadPart != 0);
    if (using_qpc)
        ticks_per_second = (osd_ticks_t)performance_count.QuadPart;
    else
        ticks_per_second = 1000;

    // call ourselves to get the first value
    return osd_ticks();
}


//============================================================
//  osd_ticks_per_second
//============================================================

osd_ticks_t osd_ticks_per_second(void)
{
    if (ticks_per_second == 0)
        osd_ticks();
    return ticks_per_second;
}

//============================================================
//  osd_sleep
//============================================================

void osd_sleep(osd_ticks_t duration)
{
    DWORD msec;

    // make sure we've computed ticks_per_second
    if (ticks_per_second == 0)
        (void)osd_ticks();

    // convert to milliseconds, rounding down
    msec = (DWORD)(duration * 1000 / ticks_per_second);

    // only sleep if at least 2 full milliseconds
    if (msec >= 2)
    {
        HANDLE current_thread = GetCurrentThread();
        int old_priority = GetThreadPriority(current_thread);

        // take a couple of msecs off the top for good measure
        msec -= 2;

        // bump our thread priority super high so that we get
        // priority when we need it
        SetThreadPriority(current_thread, THREAD_PRIORITY_TIME_CRITICAL);
        Sleep(msec);
        SetThreadPriority(current_thread, old_priority);
    }
}