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std.Progress: add getIpcFd and have_ipc API

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This makes advanced use cases possible such as a long-lived child
process whose progress node gets re-attached to a different parent.
This commit is contained in:
Andrew Kelley 2024-07-14 21:38:05 -07:00
parent 716b128a24
commit f33395ce6a
1 changed files with 18 additions and 0 deletions
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18
lib/std/Progress.zig
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@ -269,6 +269,19 @@ pub const Node = struct {
storageByIndex(index).setIpcFd(fd);
}
/// Posix-only. Thread-safe. Assumes the node is storing an IPC file
/// descriptor.
pub fn getIpcFd(node: Node) ?posix.fd_t {
const index = node.index.unwrap() orelse return null;
const storage = storageByIndex(index);
const int = @atomicLoad(u32, &storage.completed_count, .monotonic);
return switch (@typeInfo(posix.fd_t)) {
.Int => @bitCast(int),
.Pointer => @ptrFromInt(int),
else => @compileError("unsupported fd_t of " ++ @typeName(posix.fd_t)),
};
}
fn storageByIndex(index: Node.Index) *Node.Storage {
return &global_progress.node_storage[@intFromEnum(index)];
}
@ -329,6 +342,11 @@ var default_draw_buffer: [4096]u8 = undefined;
var debug_start_trace = std.debug.Trace.init;
pub const have_ipc = switch (builtin.os.tag) {
.wasi, .freestanding, .windows => false,
else => true,
};
const noop_impl = builtin.single_threaded or switch (builtin.os.tag) {
.wasi, .freestanding => true,
else => false,