In preparation for switching linuxulator to the use the native 1:1

threads add a hook for cleaning thread resources before the thread die.

Differential Revision:	https://reviews.freebsd.org/D1038

15 files changed, 24 insertions, 0 deletions

diff --git a/sys/amd64/amd64/elf_machdep.c b/sys/amd64/amd64/elf_machdep.c
index 23fa39b..d1cffd9 100644
--- a/sys/amd64/amd64/elf_machdep.c
+++ b/sys/amd64/amd64/elf_machdep.c
@@ -82,6 +82,7 @@ struct sysentvec elf64_freebsd_sysvec = {
 	.sv_shared_page_base = SHAREDPAGE,
 	.sv_shared_page_len = PAGE_SIZE,
 	.sv_schedtail	= NULL,
+	.sv_thread_detach = NULL,
 };
 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec);
 
diff --git a/sys/arm/arm/elf_machdep.c b/sys/arm/arm/elf_machdep.c
index 598decc..e5cc6a0 100644
--- a/sys/arm/arm/elf_machdep.c
+++ b/sys/arm/arm/elf_machdep.c
@@ -81,6 +81,7 @@ struct sysentvec elf32_freebsd_sysvec = {
 	.sv_fetch_syscall_args = cpu_fetch_syscall_args,
 	.sv_syscallnames = syscallnames,
 	.sv_schedtail	= NULL,
+	.sv_thread_detach = NULL,
 };
 
 static Elf32_Brandinfo freebsd_brand_info = {
diff --git a/sys/compat/ia32/ia32_sysvec.c b/sys/compat/ia32/ia32_sysvec.c
index 6dd02af..51a9e9f 100644
--- a/sys/compat/ia32/ia32_sysvec.c
+++ b/sys/compat/ia32/ia32_sysvec.c
@@ -136,6 +136,7 @@ struct sysentvec ia32_freebsd_sysvec = {
 	.sv_shared_page_base = FREEBSD32_SHAREDPAGE,
 	.sv_shared_page_len = PAGE_SIZE,
 	.sv_schedtail	= NULL,
+	.sv_thread_detach = NULL,
 };
 INIT_SYSENTVEC(elf_ia32_sysvec, &ia32_freebsd_sysvec);
 
diff --git a/sys/compat/svr4/svr4_sysvec.c b/sys/compat/svr4/svr4_sysvec.c
index 561a838..125a7d8 100644
--- a/sys/compat/svr4/svr4_sysvec.c
+++ b/sys/compat/svr4/svr4_sysvec.c
@@ -196,6 +196,7 @@ struct sysentvec svr4_sysvec = {
 	.sv_fetch_syscall_args = cpu_fetch_syscall_args,
 	.sv_syscallnames = NULL,
 	.sv_schedtail	= NULL,
+	.sv_thread_detach = NULL,
 };
 
 const char      svr4_emul_path[] = "/compat/svr4";
diff --git a/sys/i386/i386/elf_machdep.c b/sys/i386/i386/elf_machdep.c
index 8cd4440..03ab10f 100644
--- a/sys/i386/i386/elf_machdep.c
+++ b/sys/i386/i386/elf_machdep.c
@@ -88,6 +88,7 @@ struct sysentvec elf32_freebsd_sysvec = {
 	.sv_shared_page_base = SHAREDPAGE,
 	.sv_shared_page_len = PAGE_SIZE,
 	.sv_schedtail	= NULL,
+	.sv_thread_detach = NULL,
 };
 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
 
diff --git a/sys/i386/ibcs2/ibcs2_sysvec.c b/sys/i386/ibcs2/ibcs2_sysvec.c
index 5d007c7..16507ee 100644
--- a/sys/i386/ibcs2/ibcs2_sysvec.c
+++ b/sys/i386/ibcs2/ibcs2_sysvec.c
@@ -89,6 +89,7 @@ struct sysentvec ibcs2_svr3_sysvec = {
 	.sv_fetch_syscall_args = cpu_fetch_syscall_args,
 	.sv_syscallnames = NULL,
 	.sv_schedtail	= NULL,
+	.sv_thread_detach = NULL,
 };
 
 static int
diff --git a/sys/kern/imgact_aout.c b/sys/kern/imgact_aout.c
index 3ae78de..edd5f5f 100644
--- a/sys/kern/imgact_aout.c
+++ b/sys/kern/imgact_aout.c
@@ -99,6 +99,7 @@ struct sysentvec aout_sysvec = {
 	.sv_fetch_syscall_args = cpu_fetch_syscall_args,
 	.sv_syscallnames = syscallnames,
 	.sv_schedtail	= NULL,
+	.sv_thread_detach = NULL,
 };
 
 #elif defined(__amd64__)
diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c
index c263356..cf4eed1 100644
--- a/sys/kern/init_main.c
+++ b/sys/kern/init_main.c
@@ -411,6 +411,7 @@ struct sysentvec null_sysvec = {
 	.sv_fetch_syscall_args = null_fetch_syscall_args,
 	.sv_syscallnames = NULL,
 	.sv_schedtail	= NULL,
+	.sv_thread_detach = NULL,
 };
 
 /*
diff --git a/sys/kern/kern_thread.c b/sys/kern/kern_thread.c
index 0dd5f46..dce760c 100644
--- a/sys/kern/kern_thread.c
+++ b/sys/kern/kern_thread.c
@@ -45,6 +45,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/sched.h>
 #include <sys/sleepqueue.h>
 #include <sys/selinfo.h>
+#include <sys/sysent.h>
 #include <sys/turnstile.h>
 #include <sys/ktr.h>
 #include <sys/rwlock.h>
@@ -884,6 +885,14 @@ thread_suspend_check(int return_instead)
 		if ((p->p_flag & P_SINGLE_EXIT) && (p->p_singlethread != td)) {
 			PROC_UNLOCK(p);
 			tidhash_remove(td);
+
+			/*
+			 * Allow Linux emulation layer to do some work
+			 * before thread suicide.
+			 */
+			if (__predict_false(p->p_sysent->sv_thread_detach != NULL))
+				(p->p_sysent->sv_thread_detach)(td);
+
 			PROC_LOCK(p);
 			tdsigcleanup(td);
 			umtx_thread_exit(td);
diff --git a/sys/mips/mips/elf_machdep.c b/sys/mips/mips/elf_machdep.c
index d374713..8cbe8d3 100644
--- a/sys/mips/mips/elf_machdep.c
+++ b/sys/mips/mips/elf_machdep.c
@@ -83,6 +83,7 @@ struct sysentvec elf64_freebsd_sysvec = {
 	.sv_fetch_syscall_args = cpu_fetch_syscall_args,
 	.sv_syscallnames = syscallnames,
 	.sv_schedtail	= NULL,
+	.sv_thread_detach = NULL,
 };
 
 static Elf64_Brandinfo freebsd_brand_info = {
@@ -139,6 +140,7 @@ struct sysentvec elf32_freebsd_sysvec = {
 	.sv_fetch_syscall_args = cpu_fetch_syscall_args,
 	.sv_syscallnames = syscallnames,
 	.sv_schedtail	= NULL,
+	.sv_thread_detach = NULL,
 };
 
 static Elf32_Brandinfo freebsd_brand_info = {
diff --git a/sys/mips/mips/freebsd32_machdep.c b/sys/mips/mips/freebsd32_machdep.c
index 9de4685b..4110e13 100644
--- a/sys/mips/mips/freebsd32_machdep.c
+++ b/sys/mips/mips/freebsd32_machdep.c
@@ -106,6 +106,7 @@ struct sysentvec elf32_freebsd_sysvec = {
 	.sv_fetch_syscall_args = cpu_fetch_syscall_args,
 	.sv_syscallnames = freebsd32_syscallnames,
 	.sv_schedtail	= NULL,
+	.sv_thread_detach = NULL,
 };
 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
 
diff --git a/sys/powerpc/powerpc/elf32_machdep.c b/sys/powerpc/powerpc/elf32_machdep.c
index ea00306..bdcd9ba 100644
--- a/sys/powerpc/powerpc/elf32_machdep.c
+++ b/sys/powerpc/powerpc/elf32_machdep.c
@@ -108,6 +108,7 @@ struct sysentvec elf32_freebsd_sysvec = {
 	.sv_shared_page_base = FREEBSD32_SHAREDPAGE,
 	.sv_shared_page_len = PAGE_SIZE,
 	.sv_schedtail	= NULL,
+	.sv_thread_detach = NULL,
 };
 INIT_SYSENTVEC(elf32_sysvec, &elf32_freebsd_sysvec);
 
diff --git a/sys/powerpc/powerpc/elf64_machdep.c b/sys/powerpc/powerpc/elf64_machdep.c
index 0b15ca3..47fbbff 100644
--- a/sys/powerpc/powerpc/elf64_machdep.c
+++ b/sys/powerpc/powerpc/elf64_machdep.c
@@ -84,6 +84,7 @@ struct sysentvec elf64_freebsd_sysvec = {
 	.sv_shared_page_base = SHAREDPAGE,
 	.sv_shared_page_len = PAGE_SIZE,
 	.sv_schedtail	= NULL,
+	.sv_thread_detach = NULL,
 };
 INIT_SYSENTVEC(elf64_sysvec, &elf64_freebsd_sysvec);
 
diff --git a/sys/sparc64/sparc64/elf_machdep.c b/sys/sparc64/sparc64/elf_machdep.c
index 4d55717..9304575 100644
--- a/sys/sparc64/sparc64/elf_machdep.c
+++ b/sys/sparc64/sparc64/elf_machdep.c
@@ -87,6 +87,7 @@ static struct sysentvec elf64_freebsd_sysvec = {
 	.sv_fetch_syscall_args = cpu_fetch_syscall_args,
 	.sv_syscallnames = syscallnames,
 	.sv_schedtail	= NULL,
+	.sv_thread_detach = NULL,
 };
 
 static Elf64_Brandinfo freebsd_brand_info = {
diff --git a/sys/sys/sysent.h b/sys/sys/sysent.h
index bef27ce..b1f61a9 100644
--- a/sys/sys/sysent.h
+++ b/sys/sys/sysent.h
@@ -136,6 +136,7 @@ struct sysentvec {
 	uint32_t	sv_timekeep_gen;
 	void		*sv_shared_page_obj;
 	void		(*sv_schedtail)(struct thread *);
+	void		(*sv_thread_detach)(struct thread *);
 };
 
 #define	SV_ILP32	0x000100