threads: remove dead code (#2176)

Signed-off-by: Nuno Cruces <ncruces@users.noreply.github.com>

internal/platform/mmap_unix.go

@@ -14,18 +14,6 @@ const (
 
 const MmapSupported = true
 
-func mmapMemory(size int) ([]byte, error) {
-	return syscall.Mmap(
-		-1,
-		0,
-		size,
-		syscall.PROT_READ|syscall.PROT_WRITE,
-		// Anonymous as this is not an actual file, but a memory,
-		// Private as this is in-process memory region.
-		syscall.MAP_ANON|syscall.MAP_PRIVATE,
-	)
-}
-
 func munmapCodeSegment(code []byte) error {
 	return syscall.Munmap(code)
 }

internal/platform/mmap_unsupported.go

@@ -23,10 +23,6 @@ func mmapCodeSegmentARM64(size int) ([]byte, error) {
 	panic(errUnsupported)
 }
 
-func mmapMemory(size int) ([]byte, error) {
-	panic(errUnsupported)
-}
-
 func MprotectRX(b []byte) (err error) {
 	panic(errUnsupported)
 }

internal/platform/mmap_windows.go

@@ -58,15 +58,6 @@ func virtualProtect(address, size, newprotect uintptr, oldprotect *uint32) error
 	return nil
 }
 
-func mmapMemory(size int) ([]byte, error) {
-	p, err := allocateMemory(uintptr(size), windows_PAGE_READWRITE)
-	if err != nil {
-		return nil, err
-	}
-
-	return unsafe.Slice((*byte)(unsafe.Pointer(p)), size), nil
-}
-
 func mmapCodeSegmentAMD64(size int) ([]byte, error) {
 	p, err := allocateMemory(uintptr(size), windows_PAGE_EXECUTE_READWRITE)
 	if err != nil {

internal/platform/platform.go

@@ -36,16 +36,6 @@ func MmapCodeSegment(size int) ([]byte, error) {
 	}
 }
 
-// MmapMemory allocates a buffer of the given size using mmap. A large size can be allocated at once
-// without raising process memory usage, and physical pages will be allocated on access after calls to
-// Grow.
-func MmapMemory(size int) ([]byte, error) {
-	if size == 0 {
-		panic("BUG: MmapMemory with zero length")
-	}
-	return mmapMemory(size)
-}
-
 // RemapCodeSegment reallocates the memory mapping of an existing code segment
 // to increase its size. The previous code mapping is unmapped and must not be
 // reused after the function returns.