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
|
package mem_virtual
import "core:sys/posix"
_reserve :: proc "contextless" (size: uint) -> (data: []byte, err: Allocator_Error) {
PROT_MPROTECT :: proc "contextless" (flags: posix.Prot_Flags) -> posix.Prot_Flags {
return transmute(posix.Prot_Flags)(transmute(i32)flags << 3)
}
result := posix.mmap(nil, size, PROT_MPROTECT({.READ, .WRITE, .EXEC}), {.ANONYMOUS, .PRIVATE})
if result == posix.MAP_FAILED {
assert_contextless(posix.errno() == .ENOMEM)
return nil, .Out_Of_Memory
}
return ([^]byte)(uintptr(result))[:size], nil
}
_decommit :: proc "contextless" (data: rawptr, size: uint) {
MADV_FREE :: 6
posix.mprotect(data, size, {})
posix.posix_madvise(data, size, transmute(posix.MAdvice)i32(MADV_FREE))
}
|
