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Fix madvise() on Windows

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Justine Tunney 2023-12-27 22:39:41 -08:00
parent f51fd97644
commit ce0143e2a1
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GPG key ID: BE714B4575D6E328
5 changed files with 121 additions and 35 deletions
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37
libc/calls/madvise-nt.c
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@ -17,46 +17,43 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/macros.internal.h"
#include "libc/nt/enum/offerpriority.h"
#include "libc/nt/memory.h"
#include "libc/nt/runtime.h"
#include "libc/nt/struct/memoryrangeentry.h"
#include "libc/sysv/consts/madv.h"
#include "libc/sysv/errfuns.h"
forceinline typeof(PrefetchVirtualMemory) *GetPrefetchVirtualMemory(void) {
static bool once;
static typeof(PrefetchVirtualMemory) *PrefetchVirtualMemory_;
if (!once) {
typedef bool32 (*__msabi PrefetchVirtualMemoryPtr)(
int64_t hProcess, uintptr_t NumberOfEntries,
struct NtMemoryRangeEntry *VirtualAddresses, uint32_t reserved_Flags);
textwindows static PrefetchVirtualMemoryPtr GetPrefetchVirtualMemory(void) {
static PrefetchVirtualMemoryPtr PrefetchVirtualMemory_;
if (!PrefetchVirtualMemory_) {
PrefetchVirtualMemory_ = /* win8.1+ */
GetProcAddressModule("Kernel32.dll", "PrefetchVirtualMemory");
once = true;
}
return PrefetchVirtualMemory_;
}
forceinline typeof(OfferVirtualMemory) *GetOfferVirtualMemory(void) {
static bool once;
static typeof(OfferVirtualMemory) *OfferVirtualMemory_;
if (!once) {
typedef bool32 (*__msabi OfferVirtualMemoryPtr)(void *inout_VirtualAddress,
size_t Size, int Priority);
textwindows static OfferVirtualMemoryPtr GetOfferVirtualMemory(void) {
static OfferVirtualMemoryPtr OfferVirtualMemory_;
if (!OfferVirtualMemory_) {
OfferVirtualMemory_ = /* win8.1+ */
GetProcAddressModule("Kernel32.dll", "OfferVirtualMemory");
once = true;
}
return OfferVirtualMemory_;
}
textwindows int sys_madvise_nt(void *addr, size_t length, int advice) {
uint32_t rangecount;
struct NtMemoryRangeEntry ranges[1];
if (advice == MADV_WILLNEED || advice == MADV_SEQUENTIAL) {
typeof(PrefetchVirtualMemory) *fn = GetPrefetchVirtualMemory();
PrefetchVirtualMemoryPtr fn = GetPrefetchVirtualMemory();
if (fn) {
ranges[0].VirtualAddress = addr;
ranges[0].NumberOfBytes = length;
rangecount = ARRAYLEN(ranges);
if (fn(GetCurrentProcess(), &rangecount, ranges, 0)) {
if (fn(GetCurrentProcess(), 1, &(struct NtMemoryRangeEntry){addr, length},
0)) {
return 0;
} else {
return __winerr();
@ -65,7 +62,7 @@ textwindows int sys_madvise_nt(void *addr, size_t length, int advice) {
return enosys();
}
} else if (advice == MADV_FREE) {
typeof(OfferVirtualMemory) *fn = GetOfferVirtualMemory();
OfferVirtualMemoryPtr fn = GetOfferVirtualMemory();
if (fn) {
if (fn(addr, length, kNtVmOfferPriorityNormal)) {
return 0;