nexoniarz/SchOS
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Threads

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A thread is a struct proc that shares three counted objects with others of
its group: the address space (struct mm: page tables, heap top, VMAs and a
lock for changing them), the descriptor table, and the signal dispositions.
clone() shares what its flags say and fork() copies.

- clone(): pthread_create's shape (VM, FILES, SIGHAND, THREAD, SETTLS,
  PARENT_SETTID, CHILD_CLEARTID) and posix_spawn's (VM, VFORK, a stack).
- futex: WAIT, WAIT_BITSET with timeouts, WAKE, REQUEUE, CMP_REQUEUE, keyed
  by the word's kernel address so shared pages meet. set_tid_address keeps
  the word that exit zeroes and wakes, for pthread_join.
- exit ends a thread; exit_group, a fatal signal, or the leader exiting ends
  them all. reapd frees exited threads; the leader is reaped by its parent
  once the rest are gone. getpid is the group, gettid the thread.
- Stops and resumes reach every thread; other process signals the leader.
- exec kills the other threads and unshares the dispositions.
- No TLB shootdown, so pages unmapped from a shared address space are freed
  only once every CPU has reloaded CR3 or is idle.
- procfs: /proc lists processes, task/ lists threads, comm, Threads:, Tgid.
- The console honours VMIN 0 / VTIME (btop's input drain hung on it).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
This commit is contained in:
Nexoniarz 2026-10-25 03:03:50 +01:00
commit f4d7f9100d
19 changed files with 1300 additions and 248 deletions
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16
kernel/sys/sys_net.c
View file

@ -123,7 +123,7 @@ sock_to_fd(struct socket *s, int sflags)
f->off = 0;
f->nonblock = (sflags & SOCK_NONBLOCK) != 0;
if (sflags & SOCK_CLOEXEC)
myproc()->ofile_flags[fd] |= FD_CLOEXEC;
myproc()->files->flags[fd] |= FD_CLOEXEC;
return fd;
}
@ -136,7 +136,7 @@ argsock(int n, struct socket **ps)
if (argint(n, &fd) < 0)
return -EBADF;
if (fd < 0 || fd >= NOFILE || !(f = myproc()->ofile[fd]))
if (fd < 0 || fd >= NOFILE || !(f = myproc()->files->ofile[fd]))
return -EBADF;
if (f->type != FD_SOCKET)
return -ENOTSOCK;
@ -471,7 +471,7 @@ SYSCALL_DEFINE(socketpair)
return fd0;
}
if ((fd1 = sock_to_fd(b, sflags)) < 0) {
myproc()->ofile[fd0] = 0;
myproc()->files->ofile[fd0] = 0;
sockclose(a);
sockclose(b);
return fd1;
@ -479,8 +479,8 @@ SYSCALL_DEFINE(socketpair)
int sv[2] = { fd0, fd1 };
if (copy_to_user(usv, sv, sizeof(sv)) < 0) {
myproc()->ofile[fd0] = 0;
myproc()->ofile[fd1] = 0;
myproc()->files->ofile[fd0] = 0;
myproc()->files->ofile[fd1] = 0;
sockclose(a);
sockclose(b);
return -EFAULT;
@ -808,7 +808,7 @@ argsockfile(int n, struct socket **ps, struct file **pf)
if (argint(n, &fd) < 0)
return -EBADF;
if (fd < 0 || fd >= NOFILE || !(f = myproc()->ofile[fd]))
if (fd < 0 || fd >= NOFILE || !(f = myproc()->files->ofile[fd]))
return -EBADF;
if (f->type != FD_SOCKET)
return -ENOTSOCK;
@ -879,7 +879,7 @@ scm_gather(struct msghdr *m, struct file **fs, int *nfp)
r = -EINVAL;
goto fail;
}
if (ufd < 0 || ufd >= NOFILE || !(f = myproc()->ofile[ufd])) {
if (ufd < 0 || ufd >= NOFILE || !(f = myproc()->files->ofile[ufd])) {
r = -EBADF;
goto fail;
}
@ -1078,7 +1078,7 @@ SYSCALL_DEFINE(recvmsg)
if (d < 0)
break;
if (flags & MSG_CMSG_CLOEXEC)
myproc()->ofile_flags[d] |= FD_CLOEXEC;
myproc()->files->flags[d] |= FD_CLOEXEC;
ufd[installed++] = d;
}