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Make fork() go 30% faster

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This change makes fork() go nearly as fast as sys_fork() on UNIX. As for
Windows this change shaves about 4-5ms off fork() + wait() latency. This
is accomplished by using WriteProcessMemory() from the parent process to
setup the address space of a suspended process; it is better than a pipe
This commit is contained in:
Justine Tunney 2025-01-01 04:59:38 -08:00
parent 98c5847727
commit 0b3c81dd4e
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GPG key ID: BE714B4575D6E328
44 changed files with 769 additions and 649 deletions
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9
libc/nt/memory.h
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@ -71,8 +71,17 @@ bool32 VirtualUnlock(const void *lpAddress, size_t dwSize);
uint64_t VirtualQuery(const void *lpAddress,
struct NtMemoryBasicInformation *lpBuffer,
uint64_t dwLength);
uint64_t VirtualQueryEx(int64_t hProcess, const void *lpAddress,
struct NtMemoryBasicInformation *lpBuffer,
uint64_t dwLength);
void *VirtualAllocEx(int64_t hProcess, void *lpAddress, uint64_t dwSize,
uint32_t flAllocationType, uint32_t flProtect);
bool32 VirtualProtectEx(int64_t hProcess, void *lpAddress, uint64_t dwSize,
uint32_t flNewProtect, uint32_t *out_lpflOldProtect);
bool32 WriteProcessMemory(int64_t hProcess, void *lpBaseAddress,
const void *lpBuffer, uint64_t nSize,
uint64_t *opt_out_lpNumberOfBytesWritten);
int64_t GetProcessHeap(void);
void *HeapAlloc(int64_t hHeap, uint32_t dwFlags, size_t dwBytes) __wur;