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Make physmem() work on Cygwin 1.5 and older.

This commit is contained in:
Lasse Collin 2009-06-27 22:57:15 +03:00
parent 7ff0004fbc
commit 73f560ee5f
1 changed files with 40 additions and 37 deletions
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77
src/common/physmem.h
View File

@ -13,7 +13,16 @@
#ifndef PHYSMEM_H
#define PHYSMEM_H
#if defined(HAVE_PHYSMEM_SYSCONF)
// Test for Windows first, because we want to use Windows-specific code
// on Cygwin, which also has memory information available via sysconf(), but
// on Cygwin 1.5 and older it gives wrong results (from our point of view).
#if defined(_WIN32) || defined(__CYGWIN__)
# ifndef _WIN32_WINNT
# define _WIN32_WINNT 0x0500
# endif
# include <windows.h>
#elif defined(HAVE_PHYSMEM_SYSCONF)
# include <unistd.h>
#elif defined(HAVE_PHYSMEM_SYSCTL)
@ -27,12 +36,6 @@
#elif defined(HAVE_PHYSMEM_SYSINFO)
# include <sys/sysinfo.h>
#elif defined(_WIN32)
# ifndef _WIN32_WINNT
# define _WIN32_WINNT 0x0500
# endif
# include <windows.h>
#elif defined(__DJGPP__)
# include <dpmi.h>
#endif
@ -47,7 +50,36 @@ physmem(void)
{
uint64_t ret = 0;
#if defined(HAVE_PHYSMEM_SYSCONF)
#if defined(_WIN32) || defined(__CYGWIN__)
if ((GetVersion() & 0xFF) >= 5) {
// Windows 2000 and later have GlobalMemoryStatusEx() which
// supports reporting values greater than 4 GiB. To keep the
// code working also on older Windows versions, use
// GlobalMemoryStatusEx() conditionally.
HMODULE kernel32 = GetModuleHandle("kernel32.dll");
if (kernel32 != NULL) {
BOOL (WINAPI *gmse)(LPMEMORYSTATUSEX) = GetProcAddress(
kernel32, "GlobalMemoryStatusEx");
if (gmse != NULL) {
MEMORYSTATUSEX meminfo;
meminfo.dwLength = sizeof(meminfo);
if (gmse(&meminfo))
ret = meminfo.ullTotalPhys;
}
}
}
if (ret == 0) {
// GlobalMemoryStatus() is supported by Windows 95 and later,
// so it is fine to link against it unconditionally. Note that
// GlobalMemoryStatus() has no return value.
MEMORYSTATUS meminfo;
meminfo.dwLength = sizeof(meminfo);
GlobalMemoryStatus(&meminfo);
ret = meminfo.dwTotalPhys;
}
#elif defined(HAVE_PHYSMEM_SYSCONF)
const long pagesize = sysconf(_SC_PAGESIZE);
const long pages = sysconf(_SC_PHYS_PAGES);
if (pagesize != -1 || pages != -1)
@ -87,35 +119,6 @@ physmem(void)
if (sysinfo(&si) == 0)
ret = (uint64_t)(si.totalram) * si.mem_unit;
#elif defined(_WIN32)
if ((GetVersion() & 0xFF) >= 5) {
// Windows 2000 and later have GlobalMemoryStatusEx() which
// supports reporting values greater than 4 GiB. To keep the
// code working also on older Windows versions, use
// GlobalMemoryStatusEx() conditionally.
HMODULE kernel32 = GetModuleHandle("kernel32.dll");
if (kernel32 != NULL) {
BOOL (WINAPI *gmse)(LPMEMORYSTATUSEX) = GetProcAddress(
kernel32, "GlobalMemoryStatusEx");
if (gmse != NULL) {
MEMORYSTATUSEX meminfo;
meminfo.dwLength = sizeof(meminfo);
if (gmse(&meminfo))
ret = meminfo.ullTotalPhys;
}
}
}
if (ret == 0) {
// GlobalMemoryStatus() is supported by Windows 95 and later,
// so it is fine to link against it unconditionally. Note that
// GlobalMemoryStatus() has no return value.
MEMORYSTATUS meminfo;
meminfo.dwLength = sizeof(meminfo);
GlobalMemoryStatus(&meminfo);
ret = meminfo.dwTotalPhys;
}
#elif defined(__DJGPP__)
__dpmi_free_mem_info meminfo;
if (__dpmi_get_free_memory_information(&meminfo) == 0