diff options
Diffstat (limited to 'hurd')
| -rw-r--r-- | hurd/io.defs | 54 |
1 files changed, 27 insertions, 27 deletions
diff --git a/hurd/io.defs b/hurd/io.defs index 5b7130cd..c36eed0a 100644 --- a/hurd/io.defs +++ b/hurd/io.defs @@ -216,7 +216,6 @@ routine io_server_version ( io_write. */ routine io_map ( io_object: io_t; - out memobjxx: mach_port_send_t; out memobjrd: mach_port_send_t; out memobjwt: mach_port_send_t); @@ -230,32 +229,34 @@ routine io_map_cntl ( io_object: io_t; out memobj: memory_object_t); -/* Users of the shared page who are USER_NOT_IT and want to become it +/* Users of the shared page who don't have the conch and want it should call this function. The server will endeavor to have - USER_IT when this returns, but users should call io_get_it in a - loop for safety. */ + USER_HAS_CONCH when this returns, but users should call io_get_it + in a loop for safety. */ /* INTR */ -routine io_get_it ( +routine io_get_conch ( io_object: io_t; cntl: memory_object_t); -/* When the user become it, the user is USER_IT. When the user is - done with the shared page, the filesystem may have changed the it - status to USER_RELEASE_IT. In that case, rather than downgrading - USER_IT to USER_POTENTIALLY_IT, the user should call io_release_it. - Also, when the user is done with an IO object and wants permanent - characteristics of the object (like file size) to be updated, the - user should call io_release_it. */ -routine io_release_it ( +/* When the user is done with the shared page, while holding the + conch, the filesystem may have changed the conch status to + USER_RELEASE_CONCH. In that case, rather than downgrading + USER_HAS_CONCH to USER_COULD_HAVE_CONCH, the user should call + io_release_conch. Also, when the user is done with an IO object + and wants permanent characteristics of the object (like file size) + to be updated, the user should call io_release_conch. Upon return, + the conch status might be either USER_COULD_HAVE_CONCH or + USER_HAS_NOT_CONCH. */ +routine io_release_conch ( io_object: io_t; cntl: memory_object_t); -/* This routine should be called while the user is it, after the user - has encountered an eof condition (where the file pointer is equal - to the file size). This could be used by terminals, for example, - to clear the eof condition after it is read once. The routine - should be called while the it status is USER_IT or USER_RELEASE_IT. - The user will keep it upon return. */ +/* This routine should be called while the user has the conch, after + the user has encountered an eof condition (where the file pointer + is equal to the file size). This could be used by terminals, for + example, to clear the eof condition after it is read once. The + routine should be called while the user has the conch. The user + will keep it upon return. */ routine io_eofnotify ( io_object: io_t; cntl: memory_object_t); @@ -264,8 +265,8 @@ routine io_eofnotify ( be made to io_prenotify giving the paramters of the write. Upon return from io_prenotify, there is no guarantee that the prenotify size will now permit the write, so it should be re-checked. The - routine should be called while the it status is USER_IT or - USER_RELEASE_IT. The user will keep it upon return. */ + routine should be called while the user has the conch. The user + will keep it upon return. */ routine io_prenotify ( io_object: io_t; cntl: memory_object_t; @@ -274,18 +275,17 @@ routine io_prenotify ( /* After doing a write which extends past the postnotify_size, the user needs to call io_postnotify. The routine should be called - while the it status is USER_IT or USER_RELEASE_IT. The user will - keep it upon return. */ + while the user has the conch. The user will keep it upon return. + */ routine io_postnotify ( io_object: io_t; cntl: memory_object_t; write_start: int; write_end: int); -/* This routine sleeps until the read_size is increased. The it - status should be USER_IT or USER_RELEASE_IT, and will be upon - return. Any of the shared variables might change across this call. - */ +/* This routine sleeps until the read_size is increased. The routine + should be called while the user has the conch. The user will keep + it upon return. */ /* INTR */ routine io_readsleep ( io_object: io_t; |