syscalls: syscall_threadexit

src/arch/x86_64/syscall.asm

@@ -46,7 +46,8 @@ extern syscall_linkat
 extern syscall_recvmsg
 extern syscall_futex
 extern syscall_newthread
-func_count equ 45
+extern syscall_threadexit
+func_count equ 46
 
 
 func_table:
@@ -95,6 +96,7 @@ func_table:
 	dq syscall_recvmsg
 	dq syscall_futex
 	dq syscall_newthread
+	dq syscall_threadexit
 section .text
 global asm_syscall_entry
 

src/arch/x86_64/syscalllog.c

@@ -47,7 +47,9 @@ static char* syscalls[] = {
 	"syscall_fchmod",
 	"syscall_linkat",
 	"syscall_recvmsg",
-	"syscall_futex"
+	"syscall_futex",
+	"syscall_newthread",
+	"syscall_threadexit"
 	
 };
 

src/sys/syscalls/threadexit.c

@@ -0,0 +1,30 @@
+#include <kernel/syscalls.h>
+#include <kernel/sched.h>
+#include <arch/cls.h>
+#include <arch/spinlock.h>
+
+void syscall_threadexit(){
+	
+	thread_t* thread = arch_getcls()->thread;
+
+	proc_t* proc = thread->proc;
+
+	// this loop is required in order to prevent a race condition related to syscall_exit()
+	
+	spinlock_acquire(&proc->threadexitlock);
+
+	bool onlythread = true;
+
+	for(int i = 0; i < proc->threadcount; ++i){
+		if(proc->threads[i]->state != THREAD_STATE_DEAD && proc->threads[i] != thread){
+			onlythread = false;
+			break;
+		}
+	}
+	
+	if(onlythread)
+		syscall_exit(0); // if it is the only thread, use syscall_exit instead.
+		
+	sched_die();
+
+}