nixcalls are gone, they were an experiment.
time to move forward.
kernel changes will be in a separate patch.

Reference: /n/patches.lsub.org/patch/nonixcalls
Date: Sun Apr 15 13:33:40 CES 2012
Signed-off-by: nemo@lsub.org

# rm /sys/src/libc/thr
# rm /sys/src/libc/9sys/nixcall.c

--- /sys/src/libc/mkfile	Thu Apr 12 12:26:18 2012
+++ /sys/src/libc/mkfile	Sun Apr 15 13:03:52 2012
@@ -1,6 +1,6 @@
 </$objtype/mkfile
 
-PORTDIRS=9sys 9syscall fmt port thr
+PORTDIRS=9sys 9syscall fmt port
 DIRS=$PORTDIRS $CPUS
 OLDCPUS=68000 68020 sparc
 
--- /sys/src/libc/9sys/mkfile	Thu Apr 12 12:26:16 2012
+++ /sys/src/libc/9sys/mkfile	Sun Apr 15 13:02:35 2012
@@ -27,7 +27,6 @@
 	getppid.$O\
 	getwd.$O\
 	iounit.$O\
-	nixcall.$O\
 	nsec.$O\
 	nulldir.$O\
 	postnote.$O\
--- /sys/include/libc.h	Thu Apr 12 12:24:41 2012
+++ /sys/include/libc.h	Sun Apr 15 12:59:52 2012
@@ -564,7 +564,7 @@
 
 /* bits in Qid.type */
 #define QTDIR		0x80		/* type bit for directories */
-#define QTAPPEND	0x40		/* type bit for append only files */
+#define QTAPPEND		0x40		/* type bit for append only files */
 #define QTEXCL		0x20		/* type bit for exclusive use files */
 #define QTMOUNT		0x10		/* type bit for mounted channel */
 #define QTAUTH		0x08		/* type bit for authentication file */
@@ -573,7 +573,7 @@
 
 /* bits in Dir.mode */
 #define DMDIR		0x80000000	/* mode bit for directories */
-#define DMAPPEND	0x40000000	/* mode bit for append only files */
+#define DMAPPEND		0x40000000	/* mode bit for append only files */
 #define DMEXCL		0x20000000	/* mode bit for exclusive use files */
 #define DMMOUNT		0x10000000	/* mode bit for mounted channel */
 #define DMAUTH		0x08000000	/* mode bit for authentication file */
@@ -603,6 +603,14 @@
 	RFCCORE		= (1<<18),
 };
 
+/* execac */
+enum
+{
+	EXTC = 0,	/* exec on time-sharing */
+	EXAC,		/* want an AC for the exec'd image */
+	EXXC,		/* want an XC for the exec'd image */
+};
+
 typedef
 struct Qid
 {
@@ -781,25 +789,6 @@
 extern	void	semstats(void);
 extern	int	semdebug;
 
-/*
- * NIX queue based system call mechanism
- */
-typedef struct Nixcall Nixcall;
-typedef struct Nixret Nixret;
-#pragma incomplete Nixcall
-#pragma incomplete Nixret
-
-extern void	nixcall(Nixcall*,int);
-extern void*	nixret(Nixret*);
-extern void	nixsyscall(void);
-
-/*
- * NIX threads using the queue based system call mechanism
- */
-extern int newthr(char*, void (*f)(int, void*[]), int, void*[]);
-extern int gettid(void);
-extern int tsyscall(int nr, ...);
-extern void texits(char *sts);
 
 /*
  * Performance counters
--- /sys/include/tos.h	Thu Apr 12 12:24:41 2012
+++ /sys/include/tos.h	Sun Apr 15 13:00:42 2012
@@ -1,37 +1,8 @@
-typedef struct Callq Callq;
-typedef struct Nixcall Nixcall;
-typedef struct Nixret Nixret;
 typedef struct Plink Plink;
 typedef struct Tos Tos;
 
 #pragma incomplete Plink
 
-#define CALLQSZ	512
-
-struct Nixcall
-{
-	void*	tag;
-	int	scall;
-	va_list	sarg;
-};
-
-struct Nixret
-{
-	void*	tag;
-	int	sret;
-	char*	err;
-};
-
-struct Callq
-{
-	int	ksleep;
-	unsigned int	qr;	/* don't use uint for ape */
-	unsigned int	qw;
-	unsigned int	rr;
-	unsigned int	rw;
-	Nixcall q[CALLQSZ];
-	Nixret	r[CALLQSZ];
-};
 
 struct Tos
 {
@@ -50,9 +21,11 @@
 	ulong	pid;		/* might as well put the pid here */
 	ulong	clock;
 
+	/*
+	 * Fields below are not available on Plan 9 kernels.
+	 */
 	int	nixtype;		/* role of the core we are running at */
 	int	core;		/* core we are running at */
-	Callq	callq;		/* NIX queue based system calls */
 	/* top of stack is here */
 };