user: implement mlibc as the libc, finally.

It's finally done..

Signed-off-by: kaguya <vpshinomiya@protonmail.com>

user/include/mlibc/options/posix/generic/sched.cpp

@@ -0,0 +1,63 @@
+
+#include <bits/ensure.h>
+#include <errno.h>
+#include <limits.h>
+#include <sched.h>
+
+#include <mlibc/debug.hpp>
+#include <mlibc/posix-sysdeps.hpp>
+
+int sched_yield(void) {
+	if(mlibc::sys_yield) {
+		mlibc::sys_yield();
+	}else{
+		// Missing sched_yield() is not an error.
+		MLIBC_MISSING_SYSDEP();
+	}
+	return 0;
+}
+
+int sched_get_priority_max(int policy) {
+	int res = 0;
+
+	auto sysdep = MLIBC_CHECK_OR_ENOSYS(mlibc::sys_get_max_priority, -1);
+	if(int e = sysdep(policy, &res); e) {
+		errno = e;
+		return -1;
+	}
+	return res;
+}
+
+int sched_get_priority_min(int policy) {
+	int res = 0;
+
+	auto sysdep = MLIBC_CHECK_OR_ENOSYS(mlibc::sys_get_min_priority, -1);
+	if(int e = sysdep(policy, &res); e) {
+		errno = e;
+		return -1;
+	}
+	return res;
+}
+
+int sched_setscheduler(pid_t, int, const struct sched_param *) {
+	__ensure(!"Not implemented");
+	__builtin_unreachable();
+}
+
+int sched_getparam(pid_t pid, struct sched_param *param) {
+	auto sysdep = MLIBC_CHECK_OR_ENOSYS(mlibc::sys_getparam, -1);
+	if(int e = sysdep(pid, param); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}
+
+int sched_setparam(pid_t pid, const struct sched_param *param) {
+	auto sysdep = MLIBC_CHECK_OR_ENOSYS(mlibc::sys_setparam, -1);
+	if(int e = sysdep(pid, param); e) {
+		errno = e;
+		return -1;
+	}
+	return 0;
+}