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std: Implement on-demand TLS allocation

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This commit is contained in:
LemonBoy 2019-05-04 16:13:02 +02:00
parent d8ab301aa8
commit cfcf02489d
1 changed files with 13 additions and 4 deletions
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17
std/os/linux/tls.zig
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@ -1,6 +1,6 @@
const std = @import("std");
const mem = std.mem;
const posix = std.posix;
const posix = std.os.posix;
const elf = std.elf;
const builtin = @import("builtin");
const assert = std.debug.assert;
@ -234,9 +234,18 @@ pub fn copyTLS(addr: usize) usize {
return addr + tls_img.tcb_offset + tls_tp_offset;
}
var main_thread_tls_buffer: [64]u8 align(32) = undefined;
var main_thread_tls_buffer: [256]u8 align(32) = undefined;
pub fn allocateTLS(size: usize) usize {
assert(size < main_thread_tls_buffer.len);
return @ptrToInt(&main_thread_tls_buffer);
// Small TLS allocation, use our local buffer
if (size < main_thread_tls_buffer.len) {
return @ptrToInt(&main_thread_tls_buffer);
}
const addr = posix.mmap(null, size, posix.PROT_READ | posix.PROT_WRITE,
posix.MAP_PRIVATE | posix.MAP_ANONYMOUS, -1, 0);
if (posix.getErrno(addr) != 0) @panic("allocateTLS failed to allocate memory");
return addr;
}