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[kernel] Have thread call scheduler on blocking

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Instead of making every callsite that may make a thread do a blocking
operation also invoke the scheduler, move that logic into thread
implementation - if the thread is blocking and is the current thread,
call schedule().

Related changes in this commit:

- Also make exiting threads and processes call the scheduler when
  blocking.
- Threads start blocked, and get automatically added to the scheduler's
  blocked list.
This commit is contained in:
Justin C. Miller
2020-09-27 21:35:15 -07:00
parent ff78c951f0
commit 87b0a93d32
9 changed files with 35 additions and 38 deletions
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13
src/kernel/syscalls/thread.cpp
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@@ -4,7 +4,6 @@
#include "log.h"
#include "objects/process.h"
#include "objects/thread.h"
#include "scheduler.h"
namespace syscalls {
@@ -21,14 +20,14 @@ thread_koid(j6_koid_t *koid)
j6_status_t
thread_create(void *rip, j6_handle_t *handle)
{
scheduler &s = scheduler::get();
thread &parent = thread::current();
process &p = parent.parent();
thread *child = p.create_thread(scheduler::default_priority);
thread *child = p.create_thread();
child->add_thunk_user(reinterpret_cast<uintptr_t>(rip));
*handle = p.add_handle(child);
s.add_thread(child->tcb());
child->clear_state(thread::state::loading);
child->set_state(thread::state::ready);
log::debug(logs::syscall, "Thread %llx spawned new thread %llx, handle %d",
parent.koid(), child->koid(), *handle);
@@ -39,11 +38,9 @@ thread_create(void *rip, j6_handle_t *handle)
j6_status_t
thread_exit(int64_t status)
{
auto &s = scheduler::get();
thread &th = thread::current();
log::debug(logs::syscall, "Thread %llx exiting with code %d", th.koid(), status);
th.exit(status);
s.schedule();
log::error(logs::syscall, "returned to exit syscall");
return j6_err_unexpected;
@@ -52,22 +49,18 @@ thread_exit(int64_t status)
j6_status_t
thread_pause()
{
auto &s = scheduler::get();
thread &th = thread::current();
th.wait_on_signals(&th, -1ull);
s.schedule();
return j6_status_ok;
}
j6_status_t
thread_sleep(uint64_t til)
{
auto &s = scheduler::get();
thread &th = thread::current();
log::debug(logs::syscall, "Thread %llx sleeping until %llu", th.koid(), til);
th.wait_on_time(til);
s.schedule();
return j6_status_ok;
}